1206-Pop and Backfire?

Toby Harter · Aug 19, 2013

My buddy has a 1206 that when you rev it all the way up it seems to pop and backfire like a gas engine. I have never seen that before so any suggestions would be appreciated. Could it possibly be a bad injector or pump?

Owen Aaland · Aug 20, 2013

More likely a push rod or valve problem.

Allan in NE · Aug 20, 2013

What Owen said,

That is a valve train issue. Possible flat cam?

Allan

Dieseltech · Aug 20, 2013

If valvetrain checks out OK the injection pump may need service. Late or no advance of cam ring will cause fuel to still burn when exhaust valve opens. Doubt it's an injector, that would show up at idle speed too.

Anonymous-0 · Aug 20, 2013

Don't know what exactly is wrong but this engine was problematic in that the front crank pulley (the dampener) the rubber fails & breaks off cam gear tooth, in extreme failures it breaks camshaft right behind gear, crank gear teeth, bends pushrods, & pistons hit valves. The crank pulley has rubber molded dampener inside, it will deteriorate & crumble, you can see/feel at front edge. If yours checks out ok, good for you, but if it don't get a new one, 701036C93 IH part & expensive, they cause so much damage not good to try a questionable used pulley.

cushman · Aug 20, 2013

I have encountered that in several diesels and have often fixed it by advancing the injection pump a couple degrees

1206-Pop and Backfire?

Toby Harter

Member

Owen Aaland

Well-known Member

Allan in NE

Well-known Member

Dieseltech

Well-known Member

Anonymous-0

Well-known Member

cushman

Member

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