Intake back pressure Ford 2000 diesel 3 cyl

Bart CA · Mar 1, 2017

There is some air coming back in the air filter stack
enough to blow some snow on the hood.

Is it normal ?

Engine runs good and strong.

Thanks in advance

Bart

Dieseltech · Mar 2, 2017

Any time you see "popping back" on the intake side can be a sign the exhaust side has issues, clearance too loose, broken exhaust arm, worn rockers, worn cam lobe. Any time the exhaust does not open fully there will be some trapped cylinder charge that will then pop back when the intake opens. Dad had a Perkins that happened to, was a broken exhaust rocker arm.

Bart CA · Mar 2, 2017

Many thanks Dieseltech

I will open the valve cover and check items you mentionned.

Thanks again !!!

Bart

sotxbill · Mar 2, 2017

leaking intake valve will allow compression to back feed into manifold.. check for too tight valve settings as well.

sunbeam · Mar 2, 2017

Could also be muffler has the exhaust tone changed?

dmbinva · Mar 2, 2017

Check the pushrods the 3 cyl is prone to have bent push rods and broken rockers

Destroked 450 · Mar 3, 2017

What makes the three cylinders more prone to push rod or rocker arm failure than the four cylinders when they have the same push rods and rocker arms.
Guess I've been lucky, I've been into a few dozen of these engines over the years (3 and 4 cyl), I've only found one bent push rod but no broken rocker arms.

RodinNS · Mar 3, 2017

Probably a burnt intake valve....

Rod

Intake back pressure Ford 2000 diesel 3 cyl

Bart CA

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Dieseltech

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Bart CA

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sotxbill

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sunbeam

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dmbinva

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Destroked 450

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RodinNS

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