Does the piston have to be greased before installation?
Major Contributor
M30 timing chain tensioner piston...
Does the piston have to be greased before installation?
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5-10 Grand Master
i oil it up good before sticking it in
all america wants is cold beer warm cat and a place to take a poop with a door on it
3 Grand Master
You're going to prime the tensioner in a bath of oil before starting the car, so it defeats the purpose.
best, whit
Major Contributor
Thank you Whit.Originally Posted by lowell
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Major Contributor
There is a minimal space between the piston and its cylinder housing. The oil goes through this space slowly, and is meant to go slowly by design.
Why?
The principle is same as that of shock absorber (it is in fact a shock absorber). The combination of "piston - spring - bypassing oil" serves to dampen the oscillation of the chain tensioner, after throttle is released... So unless one is weary of the possibility of chain tensioner oscillating for some few times while the piston goes up and down relatively freely (tensioner breaking risk), for the matter of absence of oil in the back of it, one should ensure that the cylinder is primed.
To prime the cylinder the piston must be pushed a few times manually so oil can bypass to the back of it.
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