HELP - 2000 vx 3.4 v6 blowing white smoke

[markie Lurker Find all posts View Profile Close markie]

hi all i own a 2000 vx 3.4 v6 prado and just recently had a new recon engine fitted ever since then we get a lot of white smoke only when starting morn and night.The guys who fitted the motor gave me six year warrenty and have honerd this so far its done abour 1500 ks and they have had it back replaced the heads becaus we had a cracked valve guide comp test has been done all is good there. but still white smoke it does not use any oil or water and runs like a new car,could it be fuel based problem as it is a bit thirsty if any one could help would be over the moon thanks markie brisbane queensland oz

[Mallory Black Junior Member Find all posts View Profile Close Mallory Black]

Re: HELP - 2000 vx 3.4 v6 blowing white smoke

Usually that type of scenario says there is a problem with valve stem seals or guides.
You might possibly have a damaged or improperly fitted seal, or the seals could be the wrong part and are too loose.
The amount of oil being burned in this way is very small so it will seem like it's not consuming much.
A quick test is to just let the motor idle for a few minutes while warm, than give it a few good revs, you might see some smoke, it would be a fair bet that it's seals/guides.
One quick way to see which cylinder it could be is to remove the fuses that run the fuel pump & fuel injectors, crank the motor for about 30 secs, (this ensures the motor won't start, and no petrol gets injected to wash the cylinders)
Then remove the spark plugs, remember which cylinder each one came out of, you might be able to see if any have fresh wet oil on them. (doesn't always give a result but worth trying on a motor with 2 cylinder heads, might only have to remove one.

You say that compression test is good and no variation between the cylinders so that's a good sign the bottom end is OK so the main suspect is valve seals/guides.

having said that, I have seen where oil control rings have not been installed correctly, or have stuck themselves in the piston groove, but that's rare.
sorry to the bearer of the news and if I'm wrong apologies to the engine builder!

[mike1100 Junior Member Find all posts View Profile Close mike1100]

Re: HELP - 2000 vx 3.4 v6 blowing white smoke

How many km had the prado done before the engine re-built?

[markie Lurker Find all posts View Profile Close markie]

Re: HELP - 2000 vx 3.4 v6 blowing white smoke

just over 300 thou