5 replies to this topic

[br wags]

just looking for advice
how many of you have ever replaced valve stem seals on a 2.5 motor?
do they normal start to wear(ie leak down causing slight white smoke on cold start up)
thanks

[12.SLOW]

best ppl to ask is mechanic

[fatdon]

i have the same issue atm with the 2.5 heads im running. just contemplating what to do as well. looks like im gonna change the heads.

[tmh983]

a good sign you're valve stems seals are gone is if you are coasting down a long hill at high engine vacuum for an extended time, smoke will come out when you start to accelerate again.
I've done them on a 4age before, but no idea on a suby. Might be a bit of a challenge with the engine still in the car?

[93tzlegacy]

can be done in the car, but lots easier with the engine out, need to remove the cams, pressurise the cylinder (compressed air) then compress and remove the valve spring and retainers, replace the seal then refit al lthe buts you've removed, 8 times over. you only need to do the inlet seals, the ex. ones dont leak.however most of the time if the seals are leaking and its blowing excessive smoke the valve guides may also be worn, meaning heads off and replacing / re machining / reaming the valve guides.

[br wags]

hey thanks for the replys ben and others, seems the mechanic at a certain shop were i was getting some service work (***zone) was telling some pork pies! just over fueling on cold start up.
pity that some shops cant be a litte more honest and not and try to make a quick buck.................