Re: Loud noise at the hydro tappets

Posted by JeromeSolberg On 2023/9/24 15:22:30

There are two likely possibilities:

1) The first is that you didn't check the clearance correctly for that particular tappet after you (presumably) ground the valve seats. Now the clearance is too tight for the lifter to pump up. It should be 0.030 to 0.070 cold using a gage. There were instructions on how to do this in the Kanter kit with the new tappets using one of the tappets as a gauge. A gage is also available from Pacific Northwest Packards, or you could use one of your old tappets (slightly risky).

2) The second is that particular tappet is bad for one reason or another. It could be dirty, but if it works at cold but not at hot it is more likely bad than dirty. There is a video on "Speedwell Garage" Youtube Channel where he discusses testing tappets. Ross has also on occcasion tested tappets for one. Since you are far in Australia that might be difficult. Ross made a few tappet testing tools or you can make one yourself.

Also there has been much discussion on this website using the term "noisy lifters".