Thanks for the info. Are these engines typically not a real smooth engine at 1700 plus RPMs?
3406b turbo upgrade???
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 704mover, Mar 8, 2018.
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I wonder if you are due for a new vibration dampener?Last edited: Sep 1, 2018
894964f, wore out, SAR and 1 other person Thank this. -
I agree with @Oxbow. My 7FB is smooth all the way through. Varys with governor springs when fuel starts cutting back. What is Max rpm no load in neutral?
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I'd go with a viscous damper if it has old rubber one on it.
894964f, wore out, Oxbow and 1 other person Thank this. -
Both my B models are smooth. My 86 is a 7FB my 91 is a converted PEEC with a 7fb pump. Like @Oxbow said you can twist them up but they don't pull well till they fall to 1800 or so. I am gonna say damper or timing if it's got some shake in it
beastr123, 894964f, Oxbow and 1 other person Thank this. -
Good info. thanks. Any damper better than the other? it does have what appears a damper with rubber
SP, max rpm in neutral is about 2000rpm.wore out Thanks this. -
Should be around 2300 with a good known tach. Sounds like might be a 1800 RPM governor spring. We can look it up by s/n if you want.
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Tag says bare engine high idle 2326rpm, full load rpm 2100.
This a decent model b? -
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Here are test results and performance data to give you idea on exhaust temps from pyro to manifold difference. It is run of the mill 425/1450 with 2332 RPM no load/2100 RPM load. Good ol workhorses that I would take over a new emissions crap any day of the week! Vibratech seems to be a good damper. Made in the USA. Put a viscous one on it.
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Oxbow, 894964f, SAR and 1 other person Thank this. -
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