Strange sound near the transmission
01-30-2005, 04:10 PM
#16
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Big Dave, there are two flex plates one in the front other in the rear,on later cars the rear is the one that gets loose ,the one that attaches to the converter,if they are loose its a easy fix,.but on the other hand if one is broken in the converter then you have to drop the tranny,hope this helps,cheers,Sonny.
01-30-2005, 04:45 PM
#18
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The 1987 cars still used rivets on the drive plate, if the torque converters bolts are not loose, make a reference mark on the toque converter too drive plate, remove all of the TC bolts; Thru the access hole check for any looseness of the drive plate. If the plate is lose the transmission has to be removed.
You should always turn the engine in the direction of engine rotation only, the timing belt and components were designed to operate in one direction only; and that is, engine rotation only. I have seen non Porsche motors with worn timing belts jump timing by turning the engine counter engine rotation.
You should always turn the engine in the direction of engine rotation only, the timing belt and components were designed to operate in one direction only; and that is, engine rotation only. I have seen non Porsche motors with worn timing belts jump timing by turning the engine counter engine rotation.
01-31-2005, 07:27 PM
#20
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Originally Posted by oups59
Steve,
Is it clockwise or counter clockwise ?
Is it clockwise or counter clockwise ?
- always clockwise when facing the engine: beware when upside down under the car ...
02-01-2005, 10:05 PM
#22
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Another thing to think about if you don't find anything in the bell housing is the TC. Although the bearings on the front of the TC housing can go out, it wouldn't have the sound you describe. Only way to check this is to pull the tranny and pull off the front TC housing cover. Give a spin on the splined shaft and wiggle as well...it will be evident if this is the problem. But, the TC has components that "float" inside when full of ATF. If you hold the TC in your hands, you can shake it and hear a little rattle...this is normal. If the bearing/shaft/journel inside the TC is worn, this can be a possible cause too. Just a SWAG here.
02-01-2005, 10:58 PM
#23
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I had this rattle marbles problem. It was the torque tube rear pinchbolt being loose. See my website email keepers. check your front pinchbolt too.
John Pirtle
87 a/t 173k
http://members.rennlist.com/pirtle
John Pirtle
87 a/t 173k
http://members.rennlist.com/pirtle
02-05-2005, 04:27 PM
#25
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Before I sold the Euro it made a sound very much as you described and it was the mid muffler from what I was told. The muffler between the cat and the resonator. Sounded just like a bolt just banging on everything.
02-05-2005, 07:40 PM
#27
928 Engine Re-Re-Rebuild Specialist
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Originally Posted by sonny1
Big Dave, there are two flex plates one in the front other in the rear,on later cars the rear is the one that gets loose ,the one that attaches to the converter,if they are loose its a easy fix,.but on the other hand if one is broken in the converter then you have to drop the tranny,hope this helps,cheers,Sonny.
03-03-2005, 08:21 PM
#28
Three Wheelin'
Thread Starter
Well, I found the problem. There was some load on the front flexplate. I removed the front pinch collar bolt and flexplate move back about 2-3 mm. I moved the flexplate just to be sure that it add no pressure on it. I do not use any loctite.
If you have that kind of problem, go to:
http://members.rennlist.com/v1uhoh/pinch.htm
If you have that kind of problem, go to:
http://members.rennlist.com/v1uhoh/pinch.htm
03-03-2005, 11:09 PM
#29
Rennlist Member
Originally Posted by Garth S
Oups59,
......and go in as if to loosen the pinchbolt to relieve any residual tension on the crank: if you haven't yet done this, now is a perfect time..... .
......and go in as if to loosen the pinchbolt to relieve any residual tension on the crank: if you haven't yet done this, now is a perfect time..... .
Excellent! You got 'two birds with one stone'. Normal flex plate tension release movement is ~3mm; however, this is the first link I'm aware of to the noise you have described. Possibly the slight tension in the prop shaft was sending an early warning signal via a marginal TT bearing.