PUSH ROD (tappits)

[mitchell1551]

got a T25 1.9dg auto 1987 caravelle and one of the push rods needs replacing would you replace all 8 and what other parts do you need

[kevtherev]

What happened to the push rod?
has any other damage occurred to the rocker or lifter?

[mitchell1551]

push rod ok but now the garage carnt get the tapprets set up on passenger side

[mitchell1551]

before it went into garage it was fine one minute then tappity the next ,adjust tappets then ok but one of the push rods not quite right

[itchyfeet]

Depends what the damage is.
if the rods are not seated in the tappets you can punch bits out of the circlip groove and the clip can come out.
Alternatively you can bend the rocker.

[kevtherev]

push rod ok but now the garage carnt get the tapprets set up on passenger side

they do know that your engine has hydraulic lifters I hope?
...and it's quite common for your engine to be tappety after a spell without being used.
this generally clears after a good run

[mitchell1551]

it gets used most days and it just went very loud and tappity.mate at garage thinks it could be a problem with a con rod.he adjusted all of the tappits but just the one wouldnt adjust.

[kevtherev]

it gets used most days and it just went very loud and tappity.mate at garage thinks it could be a problem with a con rod.he adjusted all of the tappits but just the one wouldnt adjust.

what did he adjust them to?

[mitchell1551]

he said he push rods had lots of play and he had to compress the valves one at a time to take play of the rods.

[mitchell1551]

it gets used most days and it just went very loud and tappity.mate at garage thinks it could be a problem with a con rod.he adjusted all of the tappits but just the one wouldnt adjust.

what did he adjust them to?

not sure and i not very mechanical minded

[itchyfeet]

Assuming he knew what he was doing, a drained hydraulic tappet will be spongy and can't be preloaded until bled.
they will bleed themselves but it takes a hot engine and a good thrash to do it.

In my experience one will often drain down when the engine is started and stopped without getting hot.

[kevtherev]

Hydraulic lifters require ONLY 1 and a 1/2 turns in from zero lash.
They rarely require adjustment, as they self adjust.
Hydraulic lifters will drain down occasionally, only persistent tapping after a 20 min run should be investigated.

If they were all loose and not spongy then it suggests that somebody has adjusted them for solid lifters and left a gap.
which will eventually destroy hydraulic lifters.


perhaps the mechanic can explain better if you ask him.

[mitchell1551]

not worked on a wbx engine so guess work.the van does about 2 mile to work and 2 mile back ..do you think i need to take it out and thrash it.just had an oil change and new filter

[kevtherev]

not worked on a wbx engine so guess work.the van does about 2 mile to work and 2 mile back ..do you think i need to take it out and thrash it.just had an oil change and new filter

I would say yes, but your pre load has been messed with, and should be reset by the book first

[mitchell1551]

not worked on a wbx engine so guess work.the van does about 2 mile to work and 2 mile back ..do you think i need to take it out and thrash it.just had an oil change and new filter

I would say yes, but your pre load has been messed with, and should be reset by the book first

how do you reset them ?