bent valves?
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Drifting
Joined: Jul 2002
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From: kenosha WI
bent valves?
ok so me and ian (mrmunky) pulled apart his engine today. it all went pretty smooth except you know theres always one bolt that decides to stirp and you have to goto a porsche specialist and barrow some of his 20,000$ tool set to fix it. but anyway we got the head off and immediately we gasp. because one of the white valves is at about a 30 degree angle in its little housing. the rest are straight but one is not flush and others have a bit of damage. so could that be ians problem. just bent valves. his timing belt seemed fine except it was missing about 3 teeth. on thursday i will take some pictures to show our progress. neither of us have ever taken apart an angine so it shoudl be interesting.
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Drifting
Joined: Jul 2002
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From: kenosha WI
i heard the belt shoudl be changed every 40 - 50 thousand miles. well this car (supposedly) has only 80 thousand, and the original belt is still in it. all i remember is that when i took the front part of the distributor housing off to expose the belt there were 3 or 4 teeth that fell down onto the floor. please tell me the pistons are supposed to have valve imprints on them also. like little notches.
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From: Finland
Ok,
you must remember that these cars are over 10 years old.Even if there is low mileage, the time has done bad things to the belts.If i had a car (Porsche) which is over 5 year old, with low miles, i would change the belts !
All 944's will have valve damage if belt is broken ! Thats a fact.
Olli
'88 951
you must remember that these cars are over 10 years old.Even if there is low mileage, the time has done bad things to the belts.If i had a car (Porsche) which is over 5 year old, with low miles, i would change the belts !
All 944's will have valve damage if belt is broken ! Thats a fact.
Olli
'88 951
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From: Costa Mesa, California
Nice pictures!
Now if you had spent just 1/10th the money on replacing the belts as soon as you got the car you wouldn't be facing a a parts bill of over $600. Add in the machinists cost to rebuild the head and it's going to be close to if not over a $1,000!
Oh yes, don't forget to properly tension the belts or you will be doing this all over again rather soon.
Now if you had spent just 1/10th the money on replacing the belts as soon as you got the car you wouldn't be facing a a parts bill of over $600. Add in the machinists cost to rebuild the head and it's going to be close to if not over a $1,000!
Oh yes, don't forget to properly tension the belts or you will be doing this all over again rather soon.
Pro
Joined: Jun 2002
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From: Athens GA
[quote]Originally posted by Olli Snellman:
<strong>All 944's will have valve damage if belt is broken ! Thats a fact.
Olli
'88 951</strong><hr></blockquote>
Broken? what about missing teeth?
I seized a water pump 5000 miles ago and the belt was missing 5 teeth. and it didn't damage a valve. my head was fine.
<strong>All 944's will have valve damage if belt is broken ! Thats a fact.
Olli
'88 951</strong><hr></blockquote>
Broken? what about missing teeth?
I seized a water pump 5000 miles ago and the belt was missing 5 teeth. and it didn't damage a valve. my head was fine.
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Michael S. Palmer
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From: Athens GA
What's funny about is was when I called my mechanic we both agreed that the motor was toast.
I had my wife drive me to the Mercedes Dealer ship. and I ended up with my second choice of colors for the benz because they didn't have one in black with the options I wanted in the system. and I needed a car ASAP.
My Porsche sat at my mechanics for 3 months. and I got this call from him telling me we were wrong.
If I just hadn't assumed the head was bad. I would have been able to order what I wanted from the Mercedes place. Every time I see a black ML I think about the head on my S2
I had my wife drive me to the Mercedes Dealer ship. and I ended up with my second choice of colors for the benz because they didn't have one in black with the options I wanted in the system. and I needed a car ASAP.
My Porsche sat at my mechanics for 3 months. and I got this call from him telling me we were wrong.
If I just hadn't assumed the head was bad. I would have been able to order what I wanted from the Mercedes place. Every time I see a black ML I think about the head on my S2
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From: Costa Mesa, California
[quote]Originally posted by deepice:
<strong>
Broken? what about missing teeth?
I seized a water pump 5000 miles ago and the belt was missing 5 teeth. and it didn't damage a valve. my head was fine.</strong><hr></blockquote>
Technically you could run with missing teeth on the timing belt. If every other tooth was missing you could run it till the belt finally broke. Only takes enough teeth to constantly engage the crank pulley -- the smaller of the two.
When the teeth come off they can catch in the crank or cam pulley and break the belt. Or they can actually cause the belt to skip a tooth or two. Same difference.
Our two friends are learning the hard way about the care and feeding of a 944. Just hope this doesn't dampen their enthusiasm for this wonderful car.
<strong>
Broken? what about missing teeth?
I seized a water pump 5000 miles ago and the belt was missing 5 teeth. and it didn't damage a valve. my head was fine.</strong><hr></blockquote>
Technically you could run with missing teeth on the timing belt. If every other tooth was missing you could run it till the belt finally broke. Only takes enough teeth to constantly engage the crank pulley -- the smaller of the two.
When the teeth come off they can catch in the crank or cam pulley and break the belt. Or they can actually cause the belt to skip a tooth or two. Same difference.
Our two friends are learning the hard way about the care and feeding of a 944. Just hope this doesn't dampen their enthusiasm for this wonderful car.
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From: Amherst, NH
Sorry to hear this.
The pistons should NOT have little imprints of the valves in them.
You're prolly looking at valves (check EVERY one for runout, etc) and a couple pistons. I'd also take a look at the rod bearings, as smacking the valves puts unwanted strain on them.
This could be a nasty rebuild, but you can do it with Rennlist's collective help!
HTH!
The pistons should NOT have little imprints of the valves in them.
You're prolly looking at valves (check EVERY one for runout, etc) and a couple pistons. I'd also take a look at the rod bearings, as smacking the valves puts unwanted strain on them.
This could be a nasty rebuild, but you can do it with Rennlist's collective help!
HTH!
Instructor
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From: Christchurch, England
[quote] The pistons should NOT have little imprints of the valves in them. <hr></blockquote>
Are you sure about that? All of the pics of the pistons I have ever seen show a couple of little dimples on the crown. They look intentional rather than valve damage.
Are you sure about that? All of the pics of the pistons I have ever seen show a couple of little dimples on the crown. They look intentional rather than valve damage.
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From: Amherst, NH
Nib -
On the turbo's, definately not. I haven't recently took apart a NA engine, so there might be slight indents on those. I assumed (perhaps incorrectly) that the car was a turbo, but I could be mistaken.
HTH!
On the turbo's, definately not. I haven't recently took apart a NA engine, so there might be slight indents on those. I assumed (perhaps incorrectly) that the car was a turbo, but I could be mistaken.
HTH!
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From: Amherst, NH
Easiest way to check quickly is to see if ALL four pistons have idential marks in them. If that's the case, then chances are the pistons came with the marks. But -- they all could have gotten smacked too.
