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Old 03-03-2016, 10:48 AM   #1
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tach

I have a 1983 120 hp ford lelham diesel engine.. the tach starts to bounch back and forth when I go over 1500 rpms any thoughts as to why and what should I check? thank you
Kevin g
new Bern NC
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Old 03-03-2016, 11:12 AM   #2
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Greetings,
Mr. K. STAY OFF BUMPY ROADS! First, easiest and cheapest, check all your electrical connections including grounds (I'm assuming electric tach'). IF a cable tach', replace cable.
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Old 03-03-2016, 12:56 PM   #3
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Quote:
Originally Posted by KEVMAR View Post
I have a 1983 120 hp ford lelham diesel engine.. the tach starts to bounch back and forth when I go over 1500 rpms any thoughts as to why and what should I check? thank you
Kevin g
new Bern NC
Check the drive belt for the alternator. It could be slipping. I'd also check the alternator itself. A lot of the Lehman tachs are alternator driven. The diagram is from VDO.


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