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D318 Fuel pump question in an 8T grader
1 year 11 months ago #241071
by oldbeek
Cat 12 grader, 8T6995 running and restoring, Cat 12 grader 9K3585. parts machine, Adams leaning wheel Pull grader Mod # 22, ser#438
D318 Fuel pump question in an 8T grader was created by oldbeek
Fuel getting into the crank case. Looked in my parts book. Only seal I see is at the front of crankshaft of the inj. pump. Seems to simple. Is that the seal that is leaking? How possible is it that the fuel transfer pump is dumping fuel into the crank case. That would be an easy fix also. My 80 yr old mind is getting fuzzy so help me out here guys. D318 engine on a friends 8t cat 12 grader.
Cat 12 grader, 8T6995 running and restoring, Cat 12 grader 9K3585. parts machine, Adams leaning wheel Pull grader Mod # 22, ser#438
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1 year 11 months ago #241074
by Delta KJ
Replied by Delta KJ on topic D318 Fuel pump question in an 8T grader
A faulty seal between the injection pump and the fuel tower housing is a common reason fuel ends up in the crankcase. The seal is actually an o-ring and it isn't difficult to replace.
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1 year 11 months ago - 1 year 11 months ago #241079
by Rome K/G
Replied by Rome K/G on topic D318 Fuel pump question in an 8T grader
Takes an 8B4967 seal [o-ring], plus the gasket between the filter housing and pump housing.
Last edit: 1 year 11 months ago by Rome K/G.
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1 year 11 months ago - 1 year 11 months ago #241085
by oldbeek
Cat 12 grader, 8T6995 running and restoring, Cat 12 grader 9K3585. parts machine, Adams leaning wheel Pull grader Mod # 22, ser#438
Replied by oldbeek on topic D318 Fuel pump question in an 8T grader
Thanks guys, With the fuel tower all filled with fuel, I am still confused how fuel can get into crank case. Got out my service manual. It shows the o-ring. Still don't see the shaft that drives the inj. pump.
Cat 12 grader, 8T6995 running and restoring, Cat 12 grader 9K3585. parts machine, Adams leaning wheel Pull grader Mod # 22, ser#438
Last edit: 1 year 11 months ago by oldbeek.
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1 year 11 months ago - 1 year 11 months ago #241088
by Rome K/G
Replied by Rome K/G on topic D318 Fuel pump question in an 8T grader
The shaft drives from the timing gears and goes through the filter housing. That area through the filter housing is open to the front gear case, oil lubes the transfer pump drive gear and inj. pump drive shaft.
Last edit: 1 year 11 months ago by Rome K/G.
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