[Vwdiesel] rabbit smoke revisited
nwall at opei.org
Thu Sep 19 09:30:56 EDT 2002
Here's a thought: Did the shop set the timing w/ the cold start knob "IN"? If
not, it'l be set at 0.50 - 0.60 MM and white smoke like hell. I did it once
(forgot to check the handle and it was pulled.) The non-diesel savy, including
seasoned mechanics, would overlook something like this!
LBaird119 at aol.com wrote:
> > The shop has re-timed the rabbit, everything is set correctly. The thing
> > still smokes like there is no tomorrow. Tech says it is dumping too
> > much fuel in and it could be a bad injection pump since I put in rebuilt
> > injectors.
> I'm sure we asked this but I sure don't remember. What color is the smoke?
> White, gray or black? White is unburned fuel. Timing, massive overfueling,
> poor compression, burning antifreeze. Gray smoke, excessive: burning oil,
> bluish gray, poor compression, generally poor engine condition or fine
> condition under full throttle. Of course then it's not really excessive.
> smoke: Partially burned excess fuel. Poor compression, possibly timing,
> bad but not hideous injector, pump volume delivery set too high, dirty air
> filter, possibly even dirty fuel filter (pump pressures out of whack). Black
> smoke nearly always happens under load or near full throttle. Otherwise
> the engine will achieve a higher rpm to equalize.
> > After hearing off this list that a lot of rebuilt injectors can still go
> > bad, I asked him to pull and test the injectors. The pump was working
> > fine before I tore the engine apart, but I didn't muck with the pump
> > except the rear screw for dial indicator and the idle screw.
> So why should the pump be bad then? I set mine wrong the first time
> I set it on the 5000TD. Things were really off and bad. I thought I'd
> messed up the pump. It turned out it was 180 off. I called Seattle
> Injector and he strongly reassured me there was NOTHING I could
> have done to the pump! He said to think of these pumps like you
> would a hammer. It's REALLY tough to damage it! Things can
> happen but the pump is not the most likely thing to fail. It's the
> least likely.
> > So.. if the pump did decide to just go bad the month it was sitting
> > idle, what are my options for a new pump? vwdieselparts.com is asking
> > $400 for a rebuilt. :(
> Options are rebuild yours, exchange yours for a rebuild, put on a used
> one or dare I say, find the real problem? ;-) Can we tell where I am on
> this? ;-D
> > I found a used one on ebay (currently $20). Works but has a small leak
> > at the pulley end. Easy to fix?
> The leaks on that end are from a dried out seal and generally a worn input
> shaft bushing. It will wobble when wiggled toward/away from the belt
> tensioner. If it's worn then it's a complete rebuild. If it's not then just
> the seal CAN be replaced. Often a new seal will take care of it even
> when the bushing is worn. Beware since a worn bushing can make the
> timing belt walk off.
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