Join Date: Apr 2011
Strange main seal leak
I hope someone can help. The other day I dropped about a cup of oil on the street in front of my father-in-law's house. The car had sat for a few days and has never leaked a drop before. I got a call a half hour into the trip home. I stopped and looked underneath and saw that there had been oil leaking, but no more seemed to be coming out, and the dipstick showed that no more that a cup had disapeared. I drove the 400 miles home and put a big piece of cardboard under the motor when I parked. Today (two days later) I went out to see what was going on. Not a drop had leaked while the car sat, but another tablespoon did fall when I started the car. Looking under, it seems pretty clear that it is coming from the front mainseal (behind the crankshaft pulley). I ran a few errands, and no more oil seems to have dropped.
Background/Possibly pertinent info:
I had an LPG system (BRC Sequential) installed just last week before a long holiday trip. It works fine. The engine runs slightly hotter, but the temp needle still never goes past 12 O'clock. The installers warned me to keep the rpms down on extended highway journeys, expecially during the first few tankups. I feel like I conformed to their advice, but I did do 2000 Km of mostly German Autobahn driving.
Also, I did an oil change about two weeks ago, and the oil is still nice and clear, which I think wouldn't be the case had I had any serious overheating. Since Saturday the motor is a bit sluggish on cold start, but runs tip-top after a few minutes. The LPG installers said that this might happen, and just to come back for some computer adjustments.
1. Is the seal toast? Why does it only leak on cold startup?
2. Could there be a connection between the gas conversion and the mainseal failure?
3. What am I looking at if I have to replace the seal?
THANKS IN ADVANCE!!!