|
|
|
|
| Author |
|
|
Registered
Join Date: Jul 2007
Posts: 69
|
comp/leakdown questions
Any reason to be concerned about the following leakdown results?
5%, 5%, 4%, 12%, 10%, 5% Comp. on the two highest counts was 135psi. Motor is a 1993 3.6 with 49k I didn't think they sounded too bad considering the mileage. Base gaskets are starting to show signs of weepage on the two higher numbers. Matt |
||
12-01-2008, 10:38 AM
|
|
|
Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,492
|
I'd sure be trying to find out what the situation is on the two leakdowns of 12% and 10%.
__________________
Kurt V No more Porsches, but a revolving number of motorcycles. |
||
|
12-01-2008, 10:55 AM
|
|
|
Registered
Join Date: Oct 2005
Location: Capistrano Beach, Ca.
Posts: 7,235
|
Quote:
Not familiar with the 3.2 but 49K is not a lot of mileage and the variation from 5-12% should raise a red flag, IMO. The "high" cylinders are 135 psi compression--what are the others?
__________________
L.J. Recovering Porsche-holic Gave up trying to stay clean Stabilized on a Pelican I.V. drip |
||
|
12-01-2008, 11:22 AM
|
|
|
Registered
Join Date: Jul 2007
Posts: 69
|
Others were ~150-155 psi I believe. The results are bing faxed up later.
Short of a teardown how can one assess the causes for the lower numbers? My best guess would be ring wear due to the seemingly tight base gaskets. The agreed price between the seller and I reflects a top end rebuild within the next year, but I am not as familiar as most of you with these causes. Thanks for the help! Matt |
||
|
12-01-2008, 11:37 AM
|
|
|
Registered
Join Date: Oct 2005
Location: Capistrano Beach, Ca.
Posts: 7,235
|
Could be something as simple as loose head studs, especially since there is weeping at the gaskets. Try retorquing the nuts and see if that improves things, as a first step.
__________________
L.J. Recovering Porsche-holic Gave up trying to stay clean Stabilized on a Pelican I.V. drip |
||
|
12-01-2008, 12:05 PM
|
|
|
Registered
Join Date: Jan 2003
Location: Langley,B.C.
Posts: 12,000
|
When one does a leakdown, they should be seeing where the leakage is occuring, that is one of the main reasons to do the test.....
Cheers
__________________
Turn3 Autosport- Full Service and Race Prep www.turn3autosport.com 997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3 |
||
|
12-01-2008, 12:08 PM
|
|
|
|
Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,431
|
you should always recheck any high leakdown numbers by running the engine again in hopes of blowing out any carbon bits that fell from removing the plugs that may be trapped between valve and seat. i never get too excited about high numbers until after one or two rechecks. was the engine hot or cold when that was done? needs to be hot.
__________________
https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
||
|
12-01-2008, 12:45 PM
|
|
