Grinding profile for Fiat hydraulic lifters

[judderbar]

I have taken the cam carrier off of my punto looking for the source of a tapping sound. The flat end of the best looking hydraulic lifters do not appear to have any noticeable shape on them. Taking two together they just fit exactly together with no light visible and no rocking around.

Does anybody know what profile they are supposed to have on them?

 

[varesecrazy]

fingers99 is probably the best bet here..,

or oldhammer maybe.

Charlie

 

[maggers]

I think you'll find that's how they are supposed to be so presumably your other ones are buggered.

 

[fingers99]

Which Punto?

 

[judderbar]

Which Punto?

Thanks for the reply. Mk2b 12v 1.2 188A500

Are you saying they should be flat? I was thinking they should have a very slight convex bulge on them. The good ones seem to be in very good condition though.

 

[varesecrazy]

Thanks for the reply. Mk2b 12v 1.2 188A500

Are you saying they should be flat? I was thinking they should have a very slight convex bulge on them. The good ones seem to be in very good condition though.

TWELVE Valve..??

was expecting 16V..??

Charlie

 

[maggers]

12V? Sure it's not an 8V or 16V? Either way, they should be flat so the convex ones are worn.

 

[judderbar]

12V? Sure it's not an 8V or 16V? Either way, they should be flat so the convex ones are worn.

Thanks guys! It is a 16V

I am saying the best lifters I could find are flat and was thinking they should have a very slight convex shape on them to help them spin. Anyway even when flat they are obviously spinning and have the circles to show that.

 

[maggers]

Yeah, if you could look at the cam/lifter contact area end on it's slightly off centre to help it spin. If you need new ones try e-bay but also Amazon, I bought some Astra ones last year and the same seller was on ebay and amazon but the amazon ones were cheaper!

 

[fingers99]

I think flat. Never heard of anyone re-facing them.

 

[judderbar]

Thanks everybody.

Because my cleaned lifters were able to hold pressure very well - even for days whereas when i took them out they were already totally unpressurised after one day, and the amount of wear of the bad one did not seem to me to justify the amount of hammering, or the reason the bad one got marked with 4 lines.........I have just now put the cam carrier back on and intend to restart the engine asap to see if it makes a difference or not.

 

[maggers]

O.K. see how it goes. If the noise is still there and occurs at roughly 1/2 engine speed then it's something cam related.

 

[judderbar]

Thanks everybody.

Because my cleaned lifters were able to hold pressure very well - even for days whereas when i took them out they were already totally unpressurised after one day,

In fact once the lifters are back in the partly assembled engine, if they are overly tight it is impossible to turn the cam carrier with a spanner without recognising something is wrong. So I left the lifters pressurised by the valves and quite quickly was able to turn the cam carrier with a spanner without problems. The clicking noise I had heard before is almost certainly caused by the unpressurised lifters which have remained in a 'high' position against the cam dropping down upon the closed valve stem. All lifters will be depressurised if the engine is turned over by hand before taking it apart.

The good news is the bad tappet/hammering sound above the number 3 right exhaust valve is a much gentler sound now, but there is plenty of similar clicking elsewhere. Its a result of sorts

My best theory for the source of the hammering sound was that the only lifter which when dissasembled (by a g force by being placed on the top of a hammer and held with my thumb as the hammer was hit against rock) had the three point clip holding the check valve spring and ball lifted on one point so the clip was slightly twisted and this was the most damaged one and it was the one under the noise.. Perhaps it was like that in the engine? Possibly. I cant know for sure though because I used an almighty force to undo the first one by taping the lifter to the top of the hammer - whereas it turned out that holding the rest of them with my thumb and holding the hammer head was less of a hassle.