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Lifter-tick getting louder on Model 60

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AlbertoV05

05-03-2003 20:07:08

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I've got a Model 60 that has a lifter-tick noise that has gotten progressively worse over the past month. Checked gap between pushrods and valves; everything OK there. IF the oil line that drips oil onto the valvetrain was plugged or not "aimed" properly would that cause such a problem? I've also noticed a lot of lateral play between the rocker arms (a lot of space between them). The washers/spacers are there.
Any suggestions would be appreciated.
Thanks in advance!

Al in Iowa

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Brokenwrench

05-04-2003 09:23:36

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Re: Lifter-tick getting louder on Model 60 in reply to AlbertoV05, 05-03-2003 20:07:08

If you are 100% sure the valvetrain is OK, check the exhaust manifold gasket. They can start to burn out in a very small area and give you the same tic-tic sound of a loose rocker arm.

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G Taylor

05-04-2003 07:01:38

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Re: Lifter-tick getting louder on Model 60 in reply to AlbertoV05, 05-03-2003 20:07:08

The exhaust valve train gets drip oiled but the intake gets only incidental splashes and mist. No valve stem seals are used so indirect lubing limits oil ingress between the intake valve stem/guide due to vacuum. A flat feeler gauge doesn't work to set lash on 47+ year old high hour components. Roll the engine so the valve is fully closed. Spin the push rod by hand and tighten the valve lash until you can't spin the rod. Loosen the lash about 1-1/4 flats on the nut. While rarely checked cams and lifters do wear on tractor engines too. Wear is increased after a rebuild if the lifters are swapped to different cam lobes. Fortunately getting the cam and lifters trued up is cheap, don't know why most people skip the step?

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cole in mo

05-04-2003 02:58:20

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Re: Lifter-tick getting louder on Model 60 in reply to AlbertoV05, 05-03-2003 20:07:08

Alberto, if it wasn't getting any oil the rockers would look dry, and you should have lots of slop in the train. you say the gap setting was correct, somtimes the rocker arm will wear, where it contacts the valve stem and using a flat feelers guage will give a false reading. remove the rockers and check for a deep depression in the rocker arm where it contacts the valve.

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F-I-T

05-04-2003 06:52:51

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Re: Re: Lifter-tick getting louder on Model 60 in reply to cole in mo, 05-04-2003 02:58:20

Al:

I think Cole might be onto something. Maybe what is happening is that from wear on the rocker arm shaft combined with a step worn in the rocker arm to valve stem contact, the rocker starts to move the valve, then it "clicks" itself off of that unworn edge and drops down. That would make ofr a pronounec "clack".

I had some wear like on my '70'D rocker arms, and I removed the uneven surface on a disc sander, then re-set all clearances. Lost some noise that way.

There's not much to the cam followers, just a cup for the pushrod, and a bore for the follower. I doubt that there is much doing up there in terms of wear, but of course could be wrong.

I'd start by truing up those rocker arm surfaces. It sure is an easy thing to do, and certainly will not do any harm. They used to do that regularly on 235 Chevy's.

Frank-in-Tallahassee
70D // 855

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