HOW TO: Installing a Fuel Pump Lash Cap in an LT1 and Checking for Proper Clearances - Page 2 - CorvetteForum - Chevrolet Corvette Forum Discussion



C7 Tech/Performance
Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

HOW TO: Installing a Fuel Pump Lash Cap in an LT1 and Checking for Proper Clearances

Reply
 
 
 
Thread Tools Search this Thread
Old 10-11-2017, 01:27 AM   #21
WarHammer619
CF Senior Member
 
WarHammer619's Avatar
 
Member Since: May 2017
Location: San Diego CA
Posts: 122
Thanked 11 Times in 11 Posts
Default

Such amazing information!!!!!!!!!!!
WarHammer619 is offline   Reply With Quote
The Following User Says Thank You to WarHammer619 For This Useful Post:
FYREANT (10-11-2017)
Old 11-20-2017, 10:59 PM   #22
ChrisG23
Junior Member
 
Member Since: Jul 2017
Posts: 43
Thanked 14 Times in 12 Posts
Default

Ant, first off thank you SO much. You are a godsend. My question is related to finding base of circle. If the base of circle is reduced to give us our +32% fuel lobe, then wouldn't that tool bottom out before reaching it? Or will the tool you mentioned not sit flush at base of circle on a stock fuel lobe?
ChrisG23 is offline   Reply With Quote
Old 11-21-2017, 05:32 AM   #23
FYREANT
I'm Batman..
Support Corvetteforum!
Tech Contributor
Thread Starter
 
FYREANT's Avatar
 
Member Since: Apr 2014
Location: Lehigh Acres FL
Posts: 4,388
Thanked 446 Times in 294 Posts
Default

Quote:
Originally Posted by ChrisG23 View Post
Ant, first off thank you SO much. You are a godsend. My question is related to finding base of circle. If the base of circle is reduced to give us our +32% fuel lobe, then wouldn't that tool bottom out before reaching it? Or will the tool you mentioned not sit flush at base of circle on a stock fuel lobe?
Your logic is not flawed sir. The tool is designed for the stock system, and thus bottoms out properly on a stock fuel lobe. So yes, the tool does bottom out before finding true base of circle on a 32% cam lobe. However, our tool is meant to find where the lobe is and where it isn't. So it isn't critical to measure the base of circle itself, just the lobe. The 32% lobe isn't as different from a stock lobe as you would think either surprisingly.
FYREANT is offline   Reply With Quote
Old 11-21-2017, 05:49 AM   #24
ChrisG23
Junior Member
 
Member Since: Jul 2017
Posts: 43
Thanked 14 Times in 12 Posts
Default

Quote:
Originally Posted by FYREANT View Post
Your logic is not flawed sir. The tool is designed for the stock system, and thus bottoms out properly on a stock fuel lobe. So yes, the tool does bottom out before finding true base of circle on a 32% cam lobe. However, our tool is meant to find where the lobe is and where it isn't. So it isn't critical to measure the base of circle itself, just the lobe. The 32% lobe isn't as different from a stock lobe as you would think either surprisingly.

then is is possible to skip out on the tool entirely and use cam timing position to locate base of circle and maximum lift for adjusting the lash cap for proper preload and lift?

and again, I just want to thank you for an excellent technical write up that literally has taught me all I know about this subject, and has given me the confidence to tackle a cam swap on my own.

Last edited by ChrisG23; 11-21-2017 at 05:52 AM.
ChrisG23 is offline   Reply With Quote
Old 11-21-2017, 08:33 AM   #25
FYREANT
I'm Batman..
Support Corvetteforum!
Tech Contributor
Thread Starter
 
FYREANT's Avatar
 
Member Since: Apr 2014
Location: Lehigh Acres FL
Posts: 4,388
Thanked 446 Times in 294 Posts
Default

Quote:
Originally Posted by ChrisG23 View Post
then is is possible to skip out on the tool entirely and use cam timing position to locate base of circle and maximum lift for adjusting the lash cap for proper preload and lift?

and again, I just want to thank you for an excellent technical write up that literally has taught me all I know about this subject, and has given me the confidence to tackle a cam swap on my own.
First off, thank you! I am always trying to help the community!

Based on your question, I went back and re-read my guide from the standpoint of “do I need the special tool or not”. In my opinion, it’s still prudent to use the tool. The tool is used to find base of circle, as well as the highest point of the lobe later in the process. Could you use something different? Perhaps. But the tool fits into the hole in the valley cover perfectly and stays perfectly upright when you are turning the cam to locate the highest point. If you used a flat piece of metal or something similar, it may not yield accurate results. For the cost of the tool it’s not something I would chance personally. Plus you can always sell the tool when you are done using it.

Ant
FYREANT is offline   Reply With Quote
Old 12-16-2017, 09:11 PM   #26
SteveOO
Junior Member
 
Member Since: Nov 2017
Posts: 16
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I am installing a Texas Speed cam with 32% fuel lobe, they supplied a lash cap. I have my valley cover off. It looks like there is a factory lash cap on the end of the push rod. The cap wobbles like it is mounted on a ball stud? I have not tried to pry it off. The new cap might fit over it/on top of it, but would take some force. Does this sound right?
Thanks Steveoo
SteveOO is offline   Reply With Quote
Old 12-16-2017, 09:31 PM   #27
FYREANT
I'm Batman..
Support Corvetteforum!
Tech Contributor
Thread Starter
 
FYREANT's Avatar
 
Member Since: Apr 2014
Location: Lehigh Acres FL
Posts: 4,388
Thanked 446 Times in 294 Posts
Default

Quote:
Originally Posted by SteveOO View Post
I am installing a Texas Speed cam with 32% fuel lobe, they supplied a lash cap. I have my valley cover off. It looks like there is a factory lash cap on the end of the push rod. The cap wobbles like it is mounted on a ball stud? I have not tried to pry it off. The new cap might fit over it/on top of it, but would take some force. Does this sound right?
Thanks Steveoo
Do not try removing the wobbly top. That is part of the HPFP lifter and is NOT a lash cap. Your lash cap will fit on top of it..

Ant
FYREANT is offline   Reply With Quote
Old 12-16-2017, 09:59 PM   #28
SteveOO
Junior Member
 
Member Since: Nov 2017
Posts: 16
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by FYREANT View Post
Do not try removing the wobbly top. That is part of the HPFP lifter and is NOT a lash cap. Your lash cap will fit on top of it..

Ant
How much force should it take? I am concerned if it is not seated it will distort my pre-load measurements. It does not just slide on over the lifter.
SteveOO is offline   Reply With Quote
Old 12-16-2017, 10:30 PM   #29
FYREANT
I'm Batman..
Support Corvetteforum!
Tech Contributor
Thread Starter
 
FYREANT's Avatar
 
Member Since: Apr 2014
Location: Lehigh Acres FL
Posts: 4,388
Thanked 446 Times in 294 Posts
Default

Quote:
Originally Posted by SteveOO View Post
How much force should it take? I am concerned if it is not seated it will distort my pre-load measurements. It does not just slide on over the lifter.
Mine had the same "tight fitment". I chose to use some emery cloth and sand down the inner rim of it to allow it to fit better.
FYREANT is offline   Reply With Quote
Old 01-06-2018, 10:07 PM   #30
555ctsv
CF Senior Member
 
555ctsv's Avatar
 
Member Since: Sep 2015
Location: Dallas Texas
Posts: 356
Thanked 28 Times in 25 Posts
Default

Has anyone else taken the time to do this? I have the smaller lashcap ready to go but can't find that kent moore tool. I emailed 3 people about the tool, hopefully ill hear something back on Monday.

If more than 1 person has done this procedure and also come up with the .060 lash cap being the correct one id just install that cap, but would prefer several others confirming the same results first. Otherwise ill just wait on the tool

Last edited by 555ctsv; 01-06-2018 at 10:08 PM.
555ctsv is offline   Reply With Quote
Old 01-07-2018, 10:49 AM   #31
SteveOO
Junior Member
 
Member Since: Nov 2017
Posts: 16
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by 555ctsv View Post
Has anyone else taken the time to do this? I have the smaller lashcap ready to go but can't find that kent moore tool. I emailed 3 people about the tool, hopefully ill hear something back on Monday.

If more than 1 person has done this procedure and also come up with the .060 lash cap being the correct one id just install that cap, but would prefer several others confirming the same results first. Otherwise ill just wait on the tool
I will sell the kent moore tool now that I am done with it. I paid $50.
SteveOO is offline   Reply With Quote
Old 01-07-2018, 01:35 PM   #32
555ctsv
CF Senior Member
 
555ctsv's Avatar
 
Member Since: Sep 2015
Location: Dallas Texas
Posts: 356
Thanked 28 Times in 25 Posts
Default

Quote:
Originally Posted by SteveOO View Post
I will sell the kent moore tool now that I am done with it. I paid $50.
That would be awesome! Pm'ing now

I think we had something like this going around back in my ctsv days. I bought a Hawk balancer install tool and it just kept getting sold around the forum. Very helpful
555ctsv is offline   Reply With Quote
Old 01-12-2018, 10:04 PM   #33
555ctsv
CF Senior Member
 
555ctsv's Avatar
 
Member Since: Sep 2015
Location: Dallas Texas
Posts: 356
Thanked 28 Times in 25 Posts
Default

Thanks to SteveOO for selling me that Kent Moore tool. In the middle of all this right now. Trying to rotate the engine without having to move the steering rack
Attached Images
 
555ctsv is offline   Reply With Quote
Old 01-14-2018, 01:44 AM   #34
555ctsv
CF Senior Member
 
555ctsv's Avatar
 
Member Since: Sep 2015
Location: Dallas Texas
Posts: 356
Thanked 28 Times in 25 Posts
Default

Well i got it all done today. Same results, the .060 cap was the winner for me (and the onlynsize i tried). I also reinstalled my supercharger today, it was off being rebuilt.

Car is running great so far but haven't driven it much as im on an NA tune right now.

Hopefully this proves to be a good idea long term
555ctsv is offline   Reply With Quote
Old 01-14-2018, 03:38 AM   #35
FYREANT
I'm Batman..
Support Corvetteforum!
Tech Contributor
Thread Starter
 
FYREANT's Avatar
 
Member Since: Apr 2014
Location: Lehigh Acres FL
Posts: 4,388
Thanked 446 Times in 294 Posts
Default

Quote:
Originally Posted by 555ctsv View Post
Well i got it all done today. Same results, the .060 cap was the winner for me (and the onlynsize i tried). I also reinstalled my supercharger today, it was off being rebuilt.

Car is running great so far but haven't driven it much as im on an NA tune right now.

Hopefully this proves to be a good idea long term
Great to hear you got it all done and that she’s running great! Mines still running great too 2500 miles later.

Ant
FYREANT is offline   Reply With Quote
Old 01-15-2018, 10:09 AM   #36
C7&7
CF Senior Member
 
C7&7's Avatar
 
Member Since: Mar 2010
Location: DFW TX
Posts: 4,534
Thanked 141 Times in 120 Posts
Default

Quote:
Originally Posted by 555ctsv View Post
Well i got it all done today. Same results, the .060 cap was the winner for me (and the onlynsize i tried). I also reinstalled my supercharger today, it was off being rebuilt.

Car is running great so far but haven't driven it much as im on an NA tune right now.

Hopefully this proves to be a good idea long term
Hey Kenneth! What do you have up your sleeve these days?? Rebuilding the blower?
C7&7 is offline   Reply With Quote
Old 01-16-2018, 11:56 PM   #37
555ctsv
CF Senior Member
 
555ctsv's Avatar
 
Member Since: Sep 2015
Location: Dallas Texas
Posts: 356
Thanked 28 Times in 25 Posts
Default

Quote:
Originally Posted by C7&7 View Post
Hey Kenneth! What do you have up your sleeve these days?? Rebuilding the blower?
Hey man congrats on your recent upgrades!

The day before that last 1/2 mile race in November I went to change my blower oil and found some metal flakes in it. Metal bits plus the rain and i decided to just skip the event. Sent the blower off to be inspected and Vortech said it needed to be rebuilt.

I had been hearing a noise for a while, turns out that noise was fuel related but im still glad i got the blower freshened up as well.
Attached Images
 
555ctsv is offline   Reply With Quote
Old 01-17-2018, 12:03 AM   #38
FYREANT
I'm Batman..
Support Corvetteforum!
Tech Contributor
Thread Starter
 
FYREANT's Avatar
 
Member Since: Apr 2014
Location: Lehigh Acres FL
Posts: 4,388
Thanked 446 Times in 294 Posts
Default

Quote:
Originally Posted by 555ctsv View Post
Hey man congrats on your recent upgrades!

The day before that last 1/2 mile race in November I went to change my blower oil and found some metal flakes in it. Metal bits plus the rain and i decided to just skip the event. Sent the blower off to be inspected and Vortech said it needed to be rebuilt.

I had been hearing a noise for a while, turns out that noise was fuel related but im still glad i got the blower freshened up as well.
Dis you get the lash cap installed and did it correct the noise?
FYREANT is offline   Reply With Quote
Old 01-17-2018, 01:14 AM   #39
555ctsv
CF Senior Member
 
555ctsv's Avatar
 
Member Since: Sep 2015
Location: Dallas Texas
Posts: 356
Thanked 28 Times in 25 Posts
Default

Quote:
Originally Posted by FYREANT View Post
Dis you get the lash cap installed and did it correct the noise?
Yes sir, but i haven't put any miles on the car yet. Gotta find time to get it up to the shop to load the blower tune


A while back the sound went away for a couple weeks by just replacing that low psi fuel feed line with the check valve in it; but the sound eventually came back. This time I put in the lash cap, a new lt4 pump, and another new low psi feed line; so im eager to get some miles on it to see if the sound comes back. I can't see why that little oem check valve started making noise on me twice now

This is the service bulletin mentioning the low psi feed line issues
http://www.corvetteactioncenter.com/...2017-1338.html

Last edited by 555ctsv; 01-17-2018 at 09:18 AM.
555ctsv is offline   Reply With Quote
The Following User Says Thank You to 555ctsv For This Useful Post:
FYREANT (01-17-2018)
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • HOW TO: Installing a Fuel Pump Lash Cap in an LT1 and Checking for Proper Clearances
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    HOW TO: LT1 Camshaft and Cylinder Head Install Guide FYREANT C7 Tech/Performance 44 01-12-2018 03:39 PM
    HOW TO: Installing a Cam Phaser Limiter FYREANT C7 Tech/Performance 8 12-27-2017 12:53 AM
    Lash Cap Talk/Update mittens C7 Tech/Performance 20 11-15-2017 06:43 PM
    I thought I read somewhere, lash caps were bad? irun4cops C7 Forced Induction/Nitrous 8 07-19-2017 02:15 PM
    HOW TO: Install a Mantic Twin Disc Clutch and Flywheel in your C7 FYREANT C7 Tech/Performance 4 07-14-2017 03:06 PM


    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump

    Sponsored Ads
    Vendor Directory

    All times are GMT -4. The time now is 06:40 AM.


    We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
     
    • Ask a Question
      Get answers from community experts
    Question Title:
    Description:
    Your question will be posted in: