![]() |
|
|
|
Now in 993 land ...
|
![]()
My pal bought an 84 Carrera w/ 138k miles in decent shape. Not much with respect to records, so we started a complete tuneup. We got as far as changing the oil, cap rotor and the passenger's side plugs and wires. Filled the tank with 9 quarts 20W-50, and fired it up. At idle, all was fine. Pal went around the block and returned few minutes later with a rattle at higher rpm 2000+, but not at idle.
After checking cap and rotor with nothing coming up, we traced the rattle to the driver's side chain housing. Very clearly from that area. We listened through a breaker bar and could practically sense the vibration, even with our hands. It was a rattle, not a valve tap or knock. I figured the oil change - and the short time without oil pressure from that - had triggered an event that pushed the tensioner over the edge. After this dissappointing diagnosis, we were maneuvering the car around the house to stow it. Sure enough, during this action, the noise went away. Pal drove home, 10 minutes, driving normally and there was no more noise! What's going on? Do you think air or debris got into the tensioners and now got bled out? And finally, after this experience, would you keep driving the car? More importantly, would you take it to a DE if it behaves itself until the weekend? TIA, George Last edited by aigel; 07-01-2004 at 01:03 AM.. |
||
![]() |
|
Registered
Join Date: Nov 2000
Location: Ashburn VA.
Posts: 667
|
9 qt. oil change?
My 83SC 3.0 takes 10.5qt. to fill after oil and filter change. If the oil pressure was low, it could keep the tensioner from full extension.
__________________
George My Owners Gallery Page 1983 911SC - Built July 1983 #2547 out of a total 2559 shiped to the US. in 1983. Could be the last U.S. production SC still running. 1995 BMW 525I 2001 Highlander- kid mover |
||
![]() |
|
Now in 993 land ...
|
9 qt puts it above the low mark on the dipstick. That is definitely NOT low on oil! I never fill higher than mid way. One more quart got it midway. That can't be it.
George |
||
![]() |
|
Too big to fail
|
I've had this as well after an oil change; I suspect it's something akin to having to 'burp' the tensioners.
__________________
"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
||
![]() |
|
Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,792
|
The way I understand it is the spring holds the tension on the chains and the oil pressure is a fail-safe back up. What I do know is the tensioner should at no time release pressure on the cam chain. I would be in the engine removing and checking the tensioners if it were my car.
|
||
![]() |
|
Now in 993 land ...
|
Quote:
|
||
![]() |
|
![]() |
Now in 993 land ...
|
Quote:
I'd love to hear from more people that had this problem before and what they did about it. John Walker would be a good resource here - someone with a lot of experience! George |
||
![]() |
|
Formerly bb80sc
Join Date: Aug 2001
Location: Hollywood Beach, CA
Posts: 4,361
|
Yes, some times the oil-pressure fed tensioners can do this. I would pop the chain housing covers off and take a look. You may want to put on those tensioner collars to prevent a complete collapse of the tensioner. I hope you meant that you drained and re-added the 9 qts
![]()
__________________
Cheers -Brad 2015 Cayman GTS 2015 4Runner Limited |
||
![]() |
|
Too big to fail
|
Quote:
__________________
"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
||
![]() |
|
Registered
Join Date: Jun 2002
Location: Bay Saint Louis, MS
Posts: 101
|
It wouldnt hurt to take the timing chain cover off that side of the engine and check to make sure the chains have not stretched too much. That is about the symptoms that I had when my timing chains were stretching. It was the idler arm tapping the case.
|
||
![]() |
|
Registered
Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
|
maybe the pressure on the tensioner lid will give way a little after removing chain tension. Then use a tool to try to compress it? I'd like to hear what a pro says.
__________________
Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
||
![]() |
|
Now in 993 land ...
|
Quote:
George |
||
![]() |
|
![]() |
Now in 993 land ...
|
Quote:
The thing that still puzzles me is the fact that the oil change tiggered the symptoms. My pal has put about 1k miles on the car with never hearing the noise. Any more input on the oil change part and if this will (likely) be fine for a DE? George |
||
![]() |
|