Engine Rebuild time!
Thread Starter
Pro
Joined: Sep 2006
Posts: 717
Likes: 17
From: Toronto
chain guides have 1 mm grooves in them - will replace
chain tensioner - looks okay - should i replace?
clutch is fried with chunks of metal missing - will replace
pressure plate old and will replace entire clutch
cylinder - rings are very sharp, walls of cylinders show no wear at all - will clean only
chain tensioner - looks okay - should i replace?
clutch is fried with chunks of metal missing - will replace
pressure plate old and will replace entire clutch
cylinder - rings are very sharp, walls of cylinders show no wear at all - will clean only
Last edited by Alex Sol; Jul 10, 2014 at 11:07 AM.
Rennlist Member
Joined: Nov 2005
Posts: 1,353
Likes: 1
From: san jose california
when i did mine at 160 k miles, the cylinders still had the honing marks from the factory and crank was like new, so I replaced bearings and seals all around, replaced rings, guides, tensioners, chains and gears, rockers, new cam grinds and did a valve job and at 195k miles, I still have no leaks.
It does take special tools which I bought and then sold to the next rebuilder.
You should replace guides and tensioner, and chains and gears.
And when they do the valve job be sure you use the white seals or send to either Competition Engineering-Lake Isabella, CA or Ted Robinson at German Precision-Sunnyvale Ca.
and the best advice-clean everything
then clean again,
and again.
It does take special tools which I bought and then sold to the next rebuilder.
You should replace guides and tensioner, and chains and gears.
And when they do the valve job be sure you use the white seals or send to either Competition Engineering-Lake Isabella, CA or Ted Robinson at German Precision-Sunnyvale Ca.
and the best advice-clean everything
then clean again,
and again.
Last edited by stevepaa; Dec 3, 2008 at 02:50 PM.
Thread Starter
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Joined: Sep 2006
Posts: 717
Likes: 17
From: Toronto
buck. thanks for the comments... distributor vent kit - i have not heard of this. when did this upgrade come about? this is a 1991 C2.
where should i pick one up? used / new - does i matter?
where should i pick one up? used / new - does i matter?
Thread Starter
Pro
Joined: Sep 2006
Posts: 717
Likes: 17
From: Toronto
steve,
the one on right looks just like the one on the left.... except that the left has a mirror like finish vs the right which has a matte like finish. which one is the before / after?
bearings, all seals, rings, guides - definitely replacing
chain and gears - was advised to replace
tensioners looked good so was advised not to replace
rockers - advised not to replace - my mechanic said i'd be dead first... i'm 39 yrs old....
valve job - do you mean replace valve guides, intake and exhaust valves, and machine work - i plan to do this
white seals... which ones do you mean? ie: where do they go?
by the way, can you tell from my pictures if i have the 'upgraded' piston and cylinders?
the one on right looks just like the one on the left.... except that the left has a mirror like finish vs the right which has a matte like finish. which one is the before / after?
bearings, all seals, rings, guides - definitely replacing
chain and gears - was advised to replace
tensioners looked good so was advised not to replace
rockers - advised not to replace - my mechanic said i'd be dead first... i'm 39 yrs old....
valve job - do you mean replace valve guides, intake and exhaust valves, and machine work - i plan to do this
white seals... which ones do you mean? ie: where do they go?
by the way, can you tell from my pictures if i have the 'upgraded' piston and cylinders?
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Thread Starter
Pro
Joined: Sep 2006
Posts: 717
Likes: 17
From: Toronto
o rings will be replaced
main bearings in good shape -replacing
small bearings in connecting rods in good shape - replacing
intermediate shaft bearings - in good shape - replacing
gears on intermediate shaft look good
need help: how do i post pictures without maxing out my allowable? shrink first?
main bearings in good shape -replacing
small bearings in connecting rods in good shape - replacing
intermediate shaft bearings - in good shape - replacing
gears on intermediate shaft look good
need help: how do i post pictures without maxing out my allowable? shrink first?
Rennlist Member
Joined: Nov 2005
Posts: 1,353
Likes: 1
From: san jose california
white teflon valve stem seals, these allow a little oil to lubricate the stem.
the factory ones were tighter and resulted in poor lubrication to stems resulting in wear and eventually wobble in valve seating.
if you grind the cams you should replace the rockers. don't bother trying to grind the rockers unless you work with camgrinder in placerville, ca.
you have the upgraded cylinders with the seal on top.
taking the engine apart is the easy part.
be sure to do a search here on Pelican Parts engine rebuilding forum to learn how to put adhesive/sealant on the case halves to reassemble. be sure you have Wayne Dempsey's book. it is a must to do a rebuild correctly
the factory ones were tighter and resulted in poor lubrication to stems resulting in wear and eventually wobble in valve seating.
if you grind the cams you should replace the rockers. don't bother trying to grind the rockers unless you work with camgrinder in placerville, ca.
you have the upgraded cylinders with the seal on top.
taking the engine apart is the easy part.
be sure to do a search here on Pelican Parts engine rebuilding forum to learn how to put adhesive/sealant on the case halves to reassemble. be sure you have Wayne Dempsey's book. it is a must to do a rebuild correctly
Rennlist Member
Joined: Dec 2002
Posts: 1,082
Likes: 2
From: indianapolis
engine
Hello Alex, wow that engine sure is dirty on the outside. sure is going to be nice when its all finished.
i think you can post as many pictures as you want. by the way thanks for the better picture in your last post, much better. no need to shrink if it allows you to upload.
i will pray for a perfect dry engine for you
thanks for posting, might want to find out about those rockers, whether you should do notthing or what.
good luck to you and the builder!!!!!
i think you can post as many pictures as you want. by the way thanks for the better picture in your last post, much better. no need to shrink if it allows you to upload.
i will pray for a perfect dry engine for you
thanks for posting, might want to find out about those rockers, whether you should do notthing or what.
good luck to you and the builder!!!!!
Thread Starter
Pro
Joined: Sep 2006
Posts: 717
Likes: 17
From: Toronto
white valve stems - will definitely get them
by the way, i am a member... but i just noticed it shows i'm a user....
stevepaa - thanks for the input: definitely read through at least 3 engine rebuilds (2 on rennlist and 1 on pelican) and have dempsey's book and streather's 964 book and the smaller one with the torque values etc.
I am working with my buddy who is primarily a BMW mechanic guy and has rebuilt 8 porsche motors. this is his 9th... huge fan of racing and won a race in his bmw2002 at Mosport in a 'fun' race in the 70s...
dutch - that engine is soooo filthy on the outside. inside not so bad. it will all be taken out to get cleaned, cleaned and cleaned again and carefully put back together... looking forward to it... Christmas present???
by the way, i am a member... but i just noticed it shows i'm a user....
stevepaa - thanks for the input: definitely read through at least 3 engine rebuilds (2 on rennlist and 1 on pelican) and have dempsey's book and streather's 964 book and the smaller one with the torque values etc.
I am working with my buddy who is primarily a BMW mechanic guy and has rebuilt 8 porsche motors. this is his 9th... huge fan of racing and won a race in his bmw2002 at Mosport in a 'fun' race in the 70s...
dutch - that engine is soooo filthy on the outside. inside not so bad. it will all be taken out to get cleaned, cleaned and cleaned again and carefully put back together... looking forward to it... Christmas present???
