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Cat d6b 37a

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1 month 4 weeks ago #230930 by trainzkid88
Replied by trainzkid88 on topic Cat d6b 37a
contaminated oil wont hold its viscosity.

need to find out what is leaking i would replace the gasket and seal on the lift pump first.

cat did make dye for diagnosing leaks edb spoke of it in another thread unknown if they made one for fuel.

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1 month 3 weeks ago #231126 by robclay
Replied by robclay on topic Cat d6b 37a
Ran the UV dye thru the sediment bowl. Ran the tractor about 15 minutes or so and parked it for the night. During the night though I pulled the dipstick and the oil had a slight fluorescence to it under the black light. Then the next day pulled the injection pump and the oil in there has an obvious fluorescence coming from the rack bleeding into the crank case. I shined the light down the injection pump drain and back down towards the accessory drive all lit up under the black light. Probably whatever seized up the rack has cruded up the pistons of the injection pump causing it to leak by.

Pic is looking at the forward end of the rack


Pic looking at the bottom of the injection pump at the drain

Robert
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1 month 3 weeks ago #231131 by edb
Replied by edb on topic Cat d6b 37a
Hi Team,
with the compact injection pumps little fuel would normally by pass the plungers unless very badly scored.
Any fuel dilution would likely come via leaking fuel transfer pump packing seals that may not be able to drain to ground due to blocked drain lines forcing the fuel to enter the engine lube system via the oil seal on the transfer pump drive shaft.
Later transfer pumps used 2 lip type seals instead of the packings.
Cheers,
Eddie B.
The following user(s) said Thank You: robclay

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1 month 3 weeks ago #231133 by robclay
Replied by robclay on topic Cat d6b 37a
I guess I can pull the transfer pump easier than messing with the injection pump. Engine has been running great. Thanks.

Robert

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1 month 3 weeks ago #231137 by trainzkid88
Replied by trainzkid88 on topic Cat d6b 37a
the ultra low sulphur fuel doesn't do the old seal any favours a fuel lubricity additive is a good idea.

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