4bt knock knock knock

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4bt knock knock knock

Postby m880cummins » Fri Dec 07, 2012 11:53 pm

:bom: ?

Got it running tonight. Oil system was primed, ran like a champ until I builded some boost for the second time at the end. It has a 3200 rpm spring, pump screws turned, ground pin, WH1C. Also, how bout the smoke coming from the breather?!?!

First crank with a stutter:

Image

Running:

Image

Bent pushrod?
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1985 Crew cab Cummins P7100 NV4500 D60/D80
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Re: 4bt knock knock knock

Postby BobS » Sat Dec 08, 2012 4:58 am

Where was your temporary cooling system? You should NEVER run a 4BT for more than 30 seconds without a cooling system of some kind in place. Then it should be allowed to cool down and equalize temperatures between the block and head. My guesses would be you possibly blew the head gasket, possibly warped or cracked the head, or scored/melted a piston and cylinder, probably #4. You were correct that it ran fine and was a good engine in the beginning of your video.
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Re: 4bt knock knock knock

Postby Mark Nixon » Mon Dec 10, 2012 10:35 am

Yep, cooked 'er good!
Count on a headgasket and fresh scored cylinder walls and galled pistons.
Bang up job there Gomer!

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Re: 4bt knock knock knock

Postby m880cummins » Mon Dec 10, 2012 8:01 pm

The previous owner had the oil pump break and he shut it down. I put a new pump in, primed it and then mounted a mechanical oil pressure gauge. It put out 10 psi cranking... Old oil pump broke by the idler gear. We managed to pick out all the pieces without dropping the pan. No shavings or anything and all gears were nice. Thought we were lucky. Guess not.

Charlie
1977 M880 Cummins 5 speed SOLD :(
1985 Crew cab Cummins P7100 NV4500 D60/D80
SUNY Maritime Class of 2017!
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Re: 4bt knock knock knock

Postby Diesel » Fri Dec 21, 2012 6:30 pm

m880cummins wrote:The previous owner had the oil pump break and he shut it down. I put a new pump in, primed it and then mounted a mechanical oil pressure gauge. It put out 10 psi cranking... Old oil pump broke by the idler gear. We managed to pick out all the pieces without dropping the pan. No shavings or anything and all gears were nice. Thought we were lucky. Guess not.

Charlie


What you have there doesn't sound like the effect of a previously damaged oil pump. Liquid cooled engines are not air cooled engines.
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Re: 4bt knock knock knock

Postby PToombs » Sun Jan 27, 2013 6:09 pm

Charlie, did you ever tear into this and see what happened? Get it running again?
pete

Just enough power to break everything behind the crankshaft.
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