2 1/4 tick

[pabrit]

I have a low mileage 2 1/4 that has a cam/tappet tick. It's not the rocker shaft tappet clearances.......checked them twice, hot and cold. I'm suspecting it's a tappet, guide and/or roller.

What would typically wear first. the tappet roller or cam lobe?

Can the whole tappet assembly (tappet, tappet guide, roller and set bolt) be withdrawn without taking the head off, or is it just the guide and roller that can be extracted through the top?

Thanks

 

[pabrit]

anyone?

 

[sirloy]

The head has to come off to pull anything but the push rod .
The cam very rarely wear but replace the roller with the tappet.
Before you get too deep inspect the under side of the rocker as they will wear a groove from the valve stem which makes setting the clearance difficult.

 

[apg]

The roller cam follower is a stout bit of kit...I've never seen a roller fail on anyone's vehicle in 37 years of Rovering. Tappet slides can wear and make it difficult to quiet the valve train. Try to identify which valve is causing the tap. I use a cheap, disposable stethoscope with a bit of copper tube on the end where the chest piece goes. I can listen to each individual valve to discern which is the culprit. I've found that even with a spot-on, .010 adjustment, the valve still ticks; sometimes a purposefull too-tight or too-loose shuts it up.

The typical exhaust valve failure scenario starts with the worn valve guides. The valve becomes too loose in the guide and it tips ever so slightly. Now these are designed to dance or rotate in place. (Watch 'em with a strobe sometimes....) When it tips, it no longer rotates and one spot will touch the head first each time. This develops a 'hot spot' and valve failure becomes imminent.

Cheers

 

[Ron]

I am no help, I just let mine tick away . . .

 

[singingcamel]

i would look closely @ aworn push rod. take the valve cover off and have a look while its running.you should be able to make or eliminate a upper push rod problem.i have seen tappet guides fail as well as rocker arm bushings as well good luck..marc http://singingcamel.com

 

[kevin-ct]

pabrit,

Have you found the fault yet? My truck (2.25 p)also has the same tick that you seem to have.

I found the rocker arms and shaft was badly worn, after replacing them the noise is still there.

I'm going to look at the push rods this weekend.

APG, can you tell me more about how the tappet works. Does the body of the tappet move up/down? (like normal engines) or the slider and roller inside of the housing move up and down in the body ? One more thing, If the slides are worn, do you replace the just slides or the whole tappet?

Thanks,

Kevin