valve push rod

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valve push rod

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valve push rod

Postby Mark » October 26th, 2018, 2:16 pm

Ok, while checking the valve clearance, one such rod came loose from the tappet, so the best way to put back in place is take loose the tappet assembly? The tappet screw turns really hard as I was going to just loosen it all the way to fit the push rod in place.But as hard as it turns maybe not? Any guidance ?
One more thing, I set the tappets clearance(.015" a couple of days ago)But when starting up there is a loud loose tappet noise.Then it would go away after driving it for a while.Before the pushrod came out, the clearances all had a slight drag on the feeler gauge
mark


1968 m274A5
1960 m151
1976 m151A2
1964 m416
1971 m416
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Re: valve push rod

Postby rickf » October 26th, 2018, 3:29 pm

The adjustment screws are normally tight to turn, this keeps them from turning while in operation. Sometimes you can put a piece of wood against the valve end of the rocker and push hard enough to get the clearance to pop the push rod back in. Be sure that the cylinder is at TDC so you have to move the valve as little as possible.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
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Re: valve push rod

Postby Mark » October 27th, 2018, 7:42 am

Thank you for the feedback
mark


1968 m274A5
1960 m151
1976 m151A2
1964 m416
1971 m416
Mark
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Re: valve push rod

Postby Fil Bonica » October 27th, 2018, 9:27 am

Be aware that a popped push rod can be caused by a stuck valve.
Make sure the associated valve is moving correctly.
Had the same symptons on two different engines over the years.
Hope this helps.

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Re: valve push rod

Postby Mark » October 27th, 2018, 10:39 am

Thanks Fil, how does a stuck valve happen?If the mutt sat for a while, does that cause it?But it has been driven at least once a week
mark


1968 m274A5
1960 m151
1976 m151A2
1964 m416
1971 m416
Mark
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Re: valve push rod

Postby Fil Bonica » October 27th, 2018, 11:33 am

The ones I saw were because they had set for some time.
Rust had formed on the exhaust valve stem and seize it.

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Re: valve push rod

Postby Fil Bonica » October 27th, 2018, 1:18 pm

Keep in mind that there is a spring holding the rocker arm in place.
If for some reason the rocker moved off the valve stem you could also see the push rod come loose
Have had that happen while I was adjusting valves Hot.

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