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Piston Rings


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#1 cristiano1968

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Posted 02 November 2019 - 02:47 PM

Hi I've got my engine out (cars got to get painted)
So I'm doing work on engine.
All Gaskets .timing chain
Clutch already done.
New engine mounts etc.
Engine is 998cc high compression 1989.
99he20
So my engine gave of loads of smoke so I guess it needs new piston rings?
What else shoul I change or renew ?

#2 nicklouse

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Posted 02 November 2019 - 04:08 PM

depends what in needs.

 

have you measured the bores?

have you measured the bearings?

play in the valve guides?



#3 sonikk4

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Posted 02 November 2019 - 04:08 PM

Its worth checking the bores for damage and wear. Also if the smoke was on start up then the valve guides could be worn so looking a replacing them as well.



#4 sonikk4

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Posted 02 November 2019 - 04:09 PM

Its worth checking the bores for damage and wear. Also if the smoke was on start up then the valve guides could be worn so looking a replacing them as well.

 

just beaten by Nick



#5 cristiano1968

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Posted 02 November 2019 - 05:56 PM

Not taken head of yet
So I'll see to it
Maybe change valve stems as well

#6 Curley

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Posted 02 November 2019 - 06:26 PM

Depends on how much effort/money you want to put in. Before jumping into replacing the rings i'd check to see if not the head. 

 

Take all the plugs out and do a static compression test on each of the cylinders. Attach the compression gauge to each cylinder in turn and crank it over on the starter. Record the results. It's less about the specificities value but rather the relationship between them all. Are any of the cylinders low?

 

If so put a few drops of oil into the cylinder thought the spark plug hole and repeat the compression test. Record the results. If you still get low compress on the cylinder it's cylinder head. If however the compression holds then you know its the rings.

 

If you're lucky it's the valve seats/guides and you'll get away without needing to take the bottom end apart. If however it is the rings you'll need to measure the bore to determine if you can get away with just rings or, more likely, need a rebore. And once you're into that far you'll want to replace all the bearing and check the crank (polish? grinding?).

 

Oh, and if the bottom end's apart replace the oil pump. Opportunity to change the cam  :lol:


Edited by Curley, 02 November 2019 - 11:30 PM.


#7 cristiano1968

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Posted 02 November 2019 - 08:48 PM

Hi
So it's possible to do a compression test with engine out of car ?
If so how do I go about it.
Turning the pully nut?

#8 Curley

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Posted 02 November 2019 - 11:32 PM

You can do it manually with a pry bar on the pulley nut, but I'd be tempted to hot wire the starter motor. Using the 12V battery and some jump leads hook the negative terminal up to good earthing point on the motor. Take the positive jump lead and bump the starter terminal.


Edited by Curley, 02 November 2019 - 11:36 PM.


#9 cristiano1968

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Posted 03 November 2019 - 01:29 AM

Ok thanks👍👍




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