| Cadillac Seville / Cadillac Eldorado Forum Forum for discussions regarding the past Seville and Eldorado. | Cadillac Forums: how to prevent rear main seal leaks 
11-23-07, 05:51 PM
| | Cadillac Owners Connoisseur Cadillac(s): 98 sls  | | | | | how to prevent rear main seal leaks
just as the title says
i want to know how to prevent this thing from leaking |
11-23-07, 07:16 PM
| | N* Headgasket Survivor Cadillac(s): 99 Z-rated STS, 90 Coupe Deville (sold) | | Join Date: Apr 2007 Location: The Ocean State Age: 46 | | | Re: how to prevent rear main seal leaks
I thought from the title of the thread that you had the solution  I don't think there's anything you can do that will prevent a RMS leak outside of normal preventative maintenance  |
11-23-07, 09:00 PM
| | Cadillac Owners Member Cadillac(s): White Diamond '03 DHS | | Join Date: Jun 2004 Location: Woodstock Ill. Age: 61 | | | Re: how to prevent rear main seal leaks
Pray? |
11-23-07, 09:38 PM
| | Cadillac Owners Connoisseur Cadillac(s): 98 sls | | | | | Re: how to prevent rear main seal leaks
what makes them go? |
11-23-07, 09:39 PM
| | Cadillac Owners Fanatic Cadillac(s): 2003 Seville STS | | Join Date: Oct 2007 Location: Salt Lake City, UT | | | Re: how to prevent rear main seal leaks
Get a Ford...  |
11-23-07, 09:43 PM
| | Cadillac Owners Fanatic Cadillac(s): 2003 Seville STS | | Join Date: Oct 2007 Location: Salt Lake City, UT | | | Re: how to prevent rear main seal leaks
Kidding aside, I bet it's the following.
1. Not changing the oil on time, ie dirty oil.
2. If you live in extreme climates, hot or cold, I bet this can reduce a seals life. |
11-23-07, 09:48 PM
| | Cadillac Owners Member Cadillac(s): White Diamond '03 DHS | | Join Date: Jun 2004 Location: Woodstock Ill. Age: 61 | | | Re: how to prevent rear main seal leaks
Quote:
Originally Posted by Crown Vic Owner  what makes them go? | I don't know. I haven't had one leak yet. |
11-23-07, 10:12 PM
|  | Cadillac Owners Connoisseur Cadillac(s): 2001 DTS, 2000 ETC, 1994 ETC | | Join Date: Mar 2007 Location: canada | | | Re: how to prevent rear main seal leaks
what do you mean by rear main seals.
what are these seals? |
11-23-07, 10:22 PM
| | Cadillac Owners Member Cadillac(s): White Diamond '03 DHS | | Join Date: Jun 2004 Location: Woodstock Ill. Age: 61 | | | Re: how to prevent rear main seal leaks
They are the crankshaft seals where the crankshaft exits the block. |
11-23-07, 11:13 PM
| | Cadillac Owners Connoisseur Cadillac(s): 2001 DTS, 2000 ETC, 1994 ETC | | Join Date: Mar 2007 Location: canada | | | Re: how to prevent rear main seal leaks
gotcha.
Mine have never gone.
no problem with them at all. |
11-24-07, 12:58 AM
| | Cadillac Owners Connoisseur Cadillac(s): 98 sls | | | | | Re: how to prevent rear main seal leaks
Quote:
Originally Posted by vacuumbed Kidding aside, I bet it's the following.
1. Not changing the oil on time, ie dirty oil.
2. If you live in extreme climates, hot or cold, I bet this can reduce a seals life. | ok,
and to the get a ford guy
screw you |
11-28-07, 09:49 PM
|  | Cadillac Owners Connoisseur Cadillac(s): 1997 ETC, 2000 DTS | | Join Date: Jul 2007 Location: FOUNTAIN HILLS, AZ Age: 53 | | | Re: how to prevent rear main seal leaks
Two suggestions:
Do not overfill the crankcase - in fact keep it closer to the ADD mark than the FULL mark. This will help keep the crankcase pressure down
Also, don't do what I did and switch to synthetic oil on a high mileage motor - they syn oil dissolves all the crud (however minor) that exists on the surfaces and it will cause leaks to appear that were never there before. I had read that advice many times, and when I didn't heed it and made the mistake of switching to syn oil, I learned it was true - at least for me.
Richard Moore |
11-28-07, 09:58 PM
| | Cadillac Owners Member Cadillac(s): White Diamond '03 DHS | | Join Date: Jun 2004 Location: Woodstock Ill. Age: 61 | | | Re: how to prevent rear main seal leaks
Crankcase pressure? |
11-28-07, 10:05 PM
| | Cadillac Owners Connoisseur Cadillac(s): 1997 ETC, 2000 DTS | | Join Date: Jul 2007 Location: FOUNTAIN HILLS, AZ Age: 53 | | | Re: how to prevent rear main seal leaks
I think crankcase pressure is caused by blow-by and by turbulence from the reciprocating assembly. I had read that with less oil in the crankcase there is less chance for aeration of the oil and less chance for pressure build up that exceeds the capability of the PCV system. Maybe I remember incorrectly? |
11-28-07, 10:17 PM
| | Cadillac Owners Member Cadillac(s): White Diamond '03 DHS | | Join Date: Jun 2004 Location: Woodstock Ill. Age: 61 | | | Re: how to prevent rear main seal leaks
PCV is pulling crankcase gases into the manifold. Wouldn't that negate any pressure created from blow-by (which should be pretty small)? | | Cadillac Discussion Tools | | | 
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