Glen-
With those miles, it is over due for a new cam & lifters. The cams rarely last
beyond 75,000 miles before going flat. That is not to say the engine won't run,
just not as well as it should. This does not mean a tear down, unless the
compression or oil pressure is bad. You will have to remove the valve covers &
rocker arms, intake manifold & front cover. By removing the radiator, you can
swap it all out without pulling the engine. You do not need to remove the heads
to remove the lifters.
Jim Stuart
Glen Wilson wrote:
> Hi,
>
> My SD1 started making a noise yesterday. I'm guessing it is a
> malfunctioning lifter. It is a mostly regular noise, although it does fade
> away from time to time. Sounds like it is coming from under the intake
> manifold. It's a fairly solid sounding tapping noise.
>
> Sound like a lifter?
>
> Wynn's Engine Tune and Rislone have been mentioned recently as useful snake
> oil products.
>
> If it is a lifter, is it likely that there is just a bit of crud in the
> lifter that a motor flush or something might dislodge?
>
> My best guess is that this engine has around 140K miles on it.
>
> Glen
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