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I have a problem with the rocker arm push rods falling out from under the
rocker arms on my M151A1. Can anyone help with some ideas?
Herb >>
Herb, it's not easy to diagnose the problem from afar, but here's a few
suggestions as to what could be happening:-
1. A valve is sticking in the "open" position, allowing the pushrod to
dislocate as the engine is cranked: Possible causes:-
(a) valve rocker arm sticking due to insufficient lube getting to the valve
rocker or rocker arm,
(b) weak or broken valve spring,
(c) bent or oversized valve.
2. A loose valve tappet adjuster screw (these should be torque-tested and
replaced if they don't meet the minimum). At a pinch, use something like
Loctite on the thread as a temporary repair.
The next two are highly unlikely.... but should be considered:-
3. the cam follower face (tappet) has a chunk missing, allowing it to drop
further than it should against the camshaft, when in a particular position.
4. the camshaft has a chunk missing from its operating face giving the same
results as above.
My guess is that reason 1 is the most likely, followed by reason two.
When you sort it out, please share the answer with the List.
Kind regards.....
Ken
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