L98 timing chain problem. Did it damage valves? Pull Heads?
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Re: (scorp508)
Nylon covered? What should it look like?
Mine were definitely original at 166k miles when
I pulled it out in favor of a cloyes true roller and
I saw no hint of any coating.
Mine were definitely original at 166k miles when
I pulled it out in favor of a cloyes true roller and
I saw no hint of any coating.
Methinks you have horseshoes ...
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: L98 timing chain problem. Did it damage valves? Pull Heads? (LaVidaLoca)
Besides the vulnerability of the nylon teeth, is the issue of chain stretch.
Even with all metal sprockets, the chains stretch over time. Roller chains
seem to last longer than the Morse or HY-Vo type, but even they wear out. I
am running on borrowed time. The new long block is ready. All I need is an
injection system. Good luck, and...
RACE ON!!!
1984 Crossfire
Member NHRA
[edited to fit normal format]
[Modified by CFI-EFI, 1:56 PM 6/1/2003]
Even with all metal sprockets, the chains stretch over time. Roller chains
seem to last longer than the Morse or HY-Vo type, but even they wear out. I
am running on borrowed time. The new long block is ready. All I need is an
injection system. Good luck, and...
RACE ON!!!
1984 Crossfire
Member NHRA
[edited to fit normal format]
[Modified by CFI-EFI, 1:56 PM 6/1/2003]
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
Hmm, was there any hint of chain slop?
Methinks you have horseshoes ...
Here are pictures of the original ones I pulled out, both with GM stamps. Click to enlarge.
Thread Starter
Pro
Joined: Jul 2002
Posts: 729
Likes: 4
From: Yukon OK
Re: (scorp508)
Well the heads are out and the project has taken a new direction. Now that ever thing else is out of the way pulling the block will be easy. I might as well get the rebuild out of the way.
Looking at crate engine prices I don't think I want to rework my old heads. Think I will go aluminum heads on a long block and a better cam.
I hate it when replacing a timing chain becomes replacing an engine. :lol:
Looking at crate engine prices I don't think I want to rework my old heads. Think I will go aluminum heads on a long block and a better cam.
I hate it when replacing a timing chain becomes replacing an engine. :lol:
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Re: (LaVidaLoca)
Looking at crate engine prices I don't think I want to rework
my old heads. Think I will go aluminum heads on a long block and
a better cam.
my old heads. Think I will go aluminum heads on a long block and
a better cam.
Performance crate engines: don't pay retail price, don't pay trade
price, don't settle until you find someone will to sell for cost, plus
a bit.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Re: (scorp508)
Here are pictures of the original ones I pulled out,
both with GM stamps. Click to enlarge.
both with GM stamps. Click to enlarge.
the other ones are a nylon/aluminum composite.
From your sig, your car is an '87. As I mentioned earlier
in the thread, I vaguely remember reading that there was a
change-up along the way. Apparently your engine was
built after the switch.
I haven't seen tartar like that on teeth since I bought
something from a street vendor overseas. What were
the rest of the innards like?
Aside from the buildup, the wear on the teeth doesn't
look too bad, actually. Not bad for 166k !
[Modified by Slalom4me, 12:01 AM 6/2/2003]
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
Re: (Slalom4me)
I haven't seen tartar like that on teeth since I bought something from a street vendor overseas. What were the rest of the innards like?
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Re: (scorp508)
Like brand new.
why the cam gear looked like that... It has been a while
since I've been inside someone else's engine and I don't
remember coming across an instance like this - one part
with buildup and everything else sanitary.
[Modified by Slalom4me, 12:13 AM 6/2/2003]
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Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Re: (Slalom4me)
I wonder why the cam gear looked like that... It has been a while
since I've been inside someone else's engine and I don't
remember coming across an instance like this - one part
with buildup and everything else sanitary.
since I've been inside someone else's engine and I don't
remember coming across an instance like this - one part
with buildup and everything else sanitary.
