Notices
C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette

One lifter bore freakishly tight: now what?!?

 
Old 05-12-2019, 09:13 PM
  #1  
NewbVetteGuy
CF Senior Member
Thread Starter
 
NewbVetteGuy's Avatar
 
Member Since: Jun 2016
Location: Woodinville WA
Posts: 2,492
Received 201 Likes on 176 Posts
Default One lifter bore freakishly tight: now what?!?

I tried to get both heads on, lifters in, pushrods and rockers installed today but I had one rocker left and then I realized itís never sitting back down on the base circle (this was the bore that was too tight earlier, too).

It goes in 2/3rds of the way and 3/4 of the way if I push down on it really hard but it doesnít go all the way down and itís not right.

This, the oil pan, and the intake are all I have left on the engine and itís killing me.

I grabbed some 60 grit and put it around the lifter and gave it a few cranks, then 100, then 180, finally wire wheel on the bench grinder. Cleaned it a gazillion times and made sure there was no sand in the wheel bearings put it back in; still tight...

Just not sure whether itís tight at the top or bottom of the bore and assessing the bore at this point means starting all over and Iím avoiding that like the plague...



I need some magic.



Adam
NewbVetteGuy is offline  
Old 05-12-2019, 09:25 PM
  #2  
jackson
CF Senior Member
 
Member Since: Sep 2001
Location: Timmonsville SC
Posts: 5,178
Received 171 Likes on 159 Posts
Default

First ... any adjustment is typically done to Bore Not lifter.

Quit sanding/rubbing until after you mike what you have. Mike Several & compare.

Maybe the lifter has a burr/nick ... maybe the bore has a burr/nick

What kind of lifters? Roller? PICTURE?
jackson is offline  
Old 05-12-2019, 09:33 PM
  #3  
jackson
CF Senior Member
 
Member Since: Sep 2001
Location: Timmonsville SC
Posts: 5,178
Received 171 Likes on 159 Posts
Default

Stop with the sandpaper period.

Use a fine riffler file and or a fine handstone.
jackson is offline  
Old 05-12-2019, 09:58 PM
  #4  
Gunfighter13
CF Senior Member
 
Gunfighter13's Avatar
 
Member Since: Mar 2014
Location: Texas
Posts: 192
Received 37 Likes on 36 Posts
Default

There is some kind of damage inside the lifter bore. Happens sometimes when a cam goes bad and a lifter is damaged. Forcing a damaged lifter up and out of the bore does the damage. Scope the bore and see what damage is there. If it is a nick or burr as stated before then you may be able to clean the lifter bore without taking the engine down.
Gunfighter13 is offline  
The following users liked this post:
rickimvette (05-14-2019)
Old 05-12-2019, 10:48 PM
  #5  
NewbVetteGuy
CF Senior Member
Thread Starter
 
NewbVetteGuy's Avatar
 
Member Since: Jun 2016
Location: Woodinville WA
Posts: 2,492
Received 201 Likes on 176 Posts
Default

Originally Posted by jackson View Post
First ... any adjustment is typically done to Bore Not lifter.

Quit sanding/rubbing until after you mike what you have. Mike Several & compare.

Maybe the lifter has a burr/nick ... maybe the bore has a burr/nick

What kind of lifters? Roller? PICTURE?
Roller lifters. Scorpion/ Johnson short travel retrofit rollers.

I can take a pic or video in the morning and post it back here.


Adam
NewbVetteGuy is offline  
Old 05-12-2019, 10:50 PM
  #6  
NewbVetteGuy
CF Senior Member
Thread Starter
 
NewbVetteGuy's Avatar
 
Member Since: Jun 2016
Location: Woodinville WA
Posts: 2,492
Received 201 Likes on 176 Posts
Default

I have the mics but Iím truly terrible at measuring with them. I donít think I get remotely any accuracy so it kinda defeats the purpose of measuring them.


Adam
NewbVetteGuy is offline  
Old 05-12-2019, 10:58 PM
  #7  
NewbVetteGuy
CF Senior Member
Thread Starter
 
NewbVetteGuy's Avatar
 
Member Since: Jun 2016
Location: Woodinville WA
Posts: 2,492
Received 201 Likes on 176 Posts
Default

0.875Ē flex hone??

I could soak a rag with wd40 and work it on top of the cam under the bottom of the lifter bore...



Adam
NewbVetteGuy is offline  
Old 05-13-2019, 07:28 AM
  #8  
jackson
CF Senior Member
 
Member Since: Sep 2001
Location: Timmonsville SC
Posts: 5,178
Received 171 Likes on 159 Posts
Default

The lifters should have been test-fit into bores Before the first main shell was ever put in block ...
... I say that Not to rub salt in the wound, but to advise the next fellow who's planning a build.

Don't hone anything until you KNOW what & where the problem is.

Gaging ain't worth the boxes they came in until you learn technique to use 'em.

Try Process of elimination.

Mark each lifter pair and map-out & mark each lifter bore and use a tabular sheet to track your work.

Methodically: Swap ALL lifter pairs around ALL lifter bores ... feeling for tightness ...
... that way you might help determine if it's a bad lifter or a bad bore.

If a particular lifter pair is tight in ALL bores, then that particular lifter pair likely has a problem.

If ALL lifter pairs are tight in a particular bore, then that particular bore likely has a problem.

Once you've narrowed-down the number of culprits, then closely inspect/measure.
jackson is offline  
The following users liked this post:
rickimvette (05-14-2019)
Old 05-13-2019, 07:39 AM
  #9  
derekderek
CF Senior Member
 
Member Since: Jul 2015
Location: Westville NJ
Posts: 4,917
Received 637 Likes on 590 Posts
Default

Disassemble the engine and take it to somebody that can hone that lifter bore correctly. Then clean out oil passages and start over.
derekderek is offline  
The following users liked this post:
SH-60B (05-13-2019)
Old 05-13-2019, 08:28 AM
  #10  
NewbVetteGuy
CF Senior Member
Thread Starter
 
NewbVetteGuy's Avatar
 
Member Since: Jun 2016
Location: Woodinville WA
Posts: 2,492
Received 201 Likes on 176 Posts
Default

Originally Posted by jackson View Post
The lifters should have been test-fit into bores Before the first main shell was ever put in block ...
... I say that Not to rub salt in the wound, but to advise the next fellow who's planning a build.

Don't hone anything until you KNOW what & where the problem is.

Gaging ain't worth the boxes they came in until you learn technique to use 'em.

Try Process of elimination.

Mark each lifter pair and map-out & mark each lifter bore and use a tabular sheet to track your work.

Methodically: Swap ALL lifter pairs around ALL lifter bores ... feeling for tightness ...
... that way you might help determine if it's a bad lifter or a bad bore.

If a particular lifter pair is tight in ALL bores, then that particular lifter pair likely has a problem.

If ALL lifter pairs are tight in a particular bore, then that particular bore likely has a problem.

Once you've narrowed-down the number of culprits, then closely inspect/measure.
I already tried other lifters in this bore. This lifter fits other bores just fine; no lifters fit this bore correctly.

Its this bore thatís too tight.


Adam
NewbVetteGuy is offline  
Old 05-13-2019, 08:46 AM
  #11  
jackson
CF Senior Member
 
Member Since: Sep 2001
Location: Timmonsville SC
Posts: 5,178
Received 171 Likes on 159 Posts
Default

OK ... so get in there with good light & fingers & see-feel if you find a burr ... probably gonna be at-near bottom of bore.
jackson is offline  
Old 05-13-2019, 08:53 AM
  #12  
jackson
CF Senior Member
 
Member Since: Sep 2001
Location: Timmonsville SC
Posts: 5,178
Received 171 Likes on 159 Posts
Default

about mid-way down vertical bore are the horizontal oil gallery holes ... burr/scratch can also be at-near edges of those holes.

In fact, burr can be anywhere.
jackson is offline  
Old 05-13-2019, 09:25 AM
  #13  
Goody
CF Senior Member
 
Goody's Avatar
 
Member Since: Oct 2000
Location: Oak Harbor WA
Posts: 6,229
Likes: 0
Received 3 Likes on 3 Posts
Default

Too much money is invested in the expense of an engine build to sand/grind anything while the engine is half together. More damage will be done by metal particles getting into the bearings. Tear it down and get it to a machine shop to be mic'd and corrected properly. Why risk ruining a new build just to save a few bucks? It'll be worth it later on down the road for peace of mind too.
Goody is offline  
The following users liked this post:
SH-60B (05-13-2019)
Old 05-13-2019, 10:04 AM
  #14  
Gunfighter13
CF Senior Member
 
Gunfighter13's Avatar
 
Member Since: Mar 2014
Location: Texas
Posts: 192
Received 37 Likes on 36 Posts
Default

Originally Posted by derekderek View Post
Disassemble the engine and take it to somebody that can hone that lifter bore correctly. Then clean out oil passages and start over.
I'm glad you said that I didn't want to be the guy with only bad news.
Gunfighter13 is offline  
Old 05-13-2019, 10:51 AM
  #15  
NewbVetteGuy
CF Senior Member
Thread Starter
 
NewbVetteGuy's Avatar
 
Member Since: Jun 2016
Location: Woodinville WA
Posts: 2,492
Received 201 Likes on 176 Posts
Default

Originally Posted by jackson View Post
about mid-way down vertical bore are the horizontal oil gallery holes ... burr/scratch can also be at-near edges of those holes.

In fact, burr can be anywhere.
I think thatís exactly where it is. On the one side the oil gallery holes seem right; on the other I think the bottom part of the oil galley hole sticks out into the lifter bore further making a slight ďledgeĒ kinda thing. I thought I was being kinda paranoid.



To make matters worse, I noticed that one valve guide plate is cracked in three places too. (I used a torque wrench and tightened it to spec, so no idea why it happened but I need to get another one of those now...)




I sure am paying a LOT of stupid tax on this engine build; Iíd like to think that means Iím getting smarter quickly.... (please, please, please...)


Adam

Last edited by NewbVetteGuy; 05-13-2019 at 11:20 AM.
NewbVetteGuy is offline  
Old 05-13-2019, 11:12 AM
  #16  
jackson
CF Senior Member
 
Member Since: Sep 2001
Location: Timmonsville SC
Posts: 5,178
Received 171 Likes on 159 Posts
Default

that's a cracked "guide PLATE"... that's a new on me ... 'specially happening on stand.

When trying to align rocker-to-valve tips ... Had you tried to bend it ?
jackson is offline  
Old 05-13-2019, 11:18 AM
  #17  
NewbVetteGuy
CF Senior Member
Thread Starter
 
NewbVetteGuy's Avatar
 
Member Since: Jun 2016
Location: Woodinville WA
Posts: 2,492
Received 201 Likes on 176 Posts
Default

Originally Posted by jackson View Post
that's a cracked "guide PLATE"... that's a new on me ... 'specially happening on stand.

When trying to align rocker-to-valve tips ... Had you tried to bend it ?
Yea thatís what I meant.

No I didnít try to bend it at all; once I remove it Iíll take a look at the bottom and see if thereís some random metal slag on the bottom or something. The only thing I can think of is that when I unscrewed the stud maybe some locktite chunk came up out of the threads and fell between the guide plate and the head or something like that.

Im really surprised theyíre so brittle but I guess the harder they are the more brittle they are...


Adam
NewbVetteGuy is offline  
Old 05-13-2019, 11:23 AM
  #18  
jackson
CF Senior Member
 
Member Since: Sep 2001
Location: Timmonsville SC
Posts: 5,178
Received 171 Likes on 159 Posts
Default

Maybe they're too hard.

Did the plates & studs come with the heads?
jackson is offline  
Old 05-13-2019, 12:16 PM
  #19  
DAD111
CF Senior Member
 
Member Since: Aug 2018
Location: Cincinnati, Ohio
Posts: 208
Received 35 Likes on 35 Posts
Default

Looks like your guide plate is off center in the picture – Take it loose and flip over and see if it lines up better before the new one goes on.
DAD111 is offline  
Old 05-13-2019, 12:25 PM
  #20  
jim-81
CF Senior Member
 
jim-81's Avatar
 
Member Since: Dec 2011
Location: Chardon Ohio
Posts: 1,360
Received 84 Likes on 79 Posts
Default

That is weird that the guide plate would crack like that. Would not expect that.
jim-81 is offline  

Thread Tools
Search this Thread
Quick Reply: One lifter bore freakishly tight: now what?!?


Sponsored Ads
Vendor Directory

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

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: