GU hydraulic lifters

[jackal2828]

Hi all ,

Have GU td42 99 mod with 170,000 km with a little knock in the top end and so far narrowed it down to the hydraulic lifters or just one at this stage so I'm looking at replacing them all as I can't pin point which one , from doing a few engine rebuilds before its not the best of practice to replace a new lifter surface onto an old cam lobe surface . Is this true and if so how can I avoid any damage ?

[Ben-e-boy]

hey mate, when was the last time you adjusted the tappets

[nissannewby]

Check your tappets as Ben-e said. These aren't known for being a quiet engine anyway they all have a little tick.

[jackal2828]

Yeh already adjusted the tappets and she's not just a little tick it's a knock , only on one cylinder which is very noticeable at idle and loud as hell when cold for the first two min

[nissannewby]

Are you sure it's not diesel knock? You may have an injector that's a little tired.

[jackal2828]

Wouldnt have thought it was a lazy injector the knock would be loud even when it warmed up , thanks for the ideas though might have to look further into it .

[Bambill]

You sure the lifters are hydraulic?
I think they are solid or you wouldn't have to reset them all the time clearance.

Marty

[nissannewby]

You sure the lifters are hydraulic?
I think they are solid or you wouldn't have to reset them all the time clearance.

Marty

And this. I would have they were only a basic cam follower. It could even be a faulty glow plug for the cold side of it. The knock may calm down a little once warm due to combustion chamber temps being hotter and helping with burning the fuel.

[jackal2828]

Thanks for the info guys much appreciated !