What are the symptoms? Bad blow by because valves not closing? Any tools to do a simple check? The 300SDL has 12 lifters, how to isolate the bad ones? I can put up with the noise.

Thanks

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300SDL project car

compression test will indicate problem cylinders, others will chime in with more

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed

Bad lifters normally are the result of their inability to hold oil pressure. This results in them becoming noisy like a 617 with loose valves.
Only in cases of complete failure will it show up on a compression test. The clack clack sound is the easiest way to detect them.
They can result in a loss of power & can cause high rev problems as the valves can bounce.
One would not expect them to contribute to blow by greatly.

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving

Bad lifters usually are compressed, won't hold a valve open as far as they should and thus a decrease in power (usually undetectable). Compression is not affected. The simple indication is lifter clatter/noise.

I'm told that if a lifter can be compressed by hand (with oil in it), it's bad.

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Gone to the dark side

- Jeff