|
|
|
|
| Author |
|
|
Registered
|
oil leak on rebuilt engine
rebuilt 2.7 with the intent of having not a single oil leak when finished. removed all studs from heads case etc.. tried to be very thorough, used a fine stone on all surfaces you get the idea. i used wurth flange sealant on the surfaces. after 1 or 2 hundred miles left side leak began between the cam housing and # 2 cyl head. pulled cam housing with heads then disassembled, noticed that there was no residual sealant between the cam housing and heads. the sealant had all squeezed out completely, no sealant between the surfaces, only around the perimeter. can anyone tell me what might have happened here ? the surface looks like it had no sealant applied. the sealant was borrowed from a friend, could it have been too old, or frozen at one time?
__________________
1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera Last edited by kodioneill; 04-17-2007 at 02:06 PM.. |
||
04-17-2007, 01:53 PM
|
|
|
JOT MON ABBR OTH
Join Date: Feb 2001
Location: USA
Posts: 3,238
|
Please share what type of sealant. What torque spec did you use? Is the wrench a clicker (if so is it calibrated properly)?
__________________
David '83 SC Targa (sold  ) MANLY babyblue honda '00 F250 7.3L (MINE!)'15 F250 Gas (Her Baby) '95 993 (sold )I don't take scalps. I'm civilized like white man now, I shoot man in back. |
||
|
04-17-2007, 03:46 PM
|
|
|
Super Moderator
|
Please keep in mind that the amount of sealant between the cam-towers and the heads is very very small and if done properly, might look like a very thing brown/orange film between them.
Now if you're sure there was NO sealant (ie no evidence of the excess squeezing out) then there's your leak.
__________________
Chris ---------------------------------------------- 1996 993 RS Replica 2023 KTM 890 Adventure R 1971 Norton 750 Commando Alcon Brake Kits |
||
|
04-17-2007, 03:51 PM
|
|
|
Registered
Join Date: May 2003
Posts: 3,346
|
99 percent of the time leaks there are from the rocker shafts. Yes that is just a guess but I believe it to be true.
-Andy
__________________
72 Carrera RS replica, Spec 911 racer |
||
|
04-17-2007, 03:53 PM
|
|
|
Registered
|
wurth sealant recommended torque waynes manual. don't know value now.
__________________
1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
||
|
04-17-2007, 03:54 PM
|
|
|
Registered
|
no rocker shaft leak. checked closely. for the record i'm 53 years old. Porsche trained mechanic 1972-1975, after that bmw master mechanic . Mercedes master mechanic. now golf course super.
__________________
1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
||
|
04-17-2007, 04:00 PM
|
|
|
|
Registered
Join Date: Sep 2005
Location: Winnipeg, MB Canada
Posts: 221
|
Almost impossible to say what went wrong with your original assembly.
I used the following for sealing my 3.6 motor: Outer Case Halves: Threebond 1104 Bearing Saddle Surfaces: Loctite 574 #8 Bearing (balancer end) O-Ring: Threebond 1211 Case Thru Bolts: Dow Corning 111 on Green Viton O-Rings Flywheel Seal: Curil-T Balancer Seal: Curil-T Intermediate Shaft Cover to Case: ThreeBond 1211 Oil Breather Cover to Case: ThreeBond 1211 Cylinders to Case: Curil K-2 or ThreeBond 1211 Cam Towers to Cylinder Heads: Threebond 1104 Cam Chain Housings to Case: Threebond 1104 Cam Chain Housings to Cam Towers: Threebond 1104 Cam Chain Housing Cover to Cam Chain Housing: Threebond 1104 Gaskets: Thin coat of Loctite 574 This was from advice of various experts here on Pelican. So far it has worked well, with no leaks. Kirk
__________________
1989 911 Carrera 4 (964) |
||
|
04-17-2007, 05:55 PM
|
|
1974 Porsche 911 targa 2.7
1970 Porsche 911 S 
