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stuck plungers fuel pump

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4 years 6 months ago #218893 by 8C 361
Replied by 8C 361 on topic stuck plungers fuel pump

I would remove the injector lines and try spraying a good penetrant in the outlet. There’s a discharge valve in there but maybe it leaks a little and your penetrant can soak into the piston.

Gentle tapping might get some back down but as mentioned earlier there’s always going to be one or two on the camshaft lobe, so gently is the rule. I personally would use a torch and heat the barrel of any that were uncooperative with the previous measures. The tolerances are so small that even a slight thermal expansion should help.


When working on trying to free up stuck pumps do not be tempted to apply rotational force to the sector gear on the plunger. This gear is simply clamped to the plunger and represents a precise calibration that is not easily done. Up and down tapping is okay .

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4 years 6 months ago #218897 by neil
Replied by neil on topic stuck plungers fuel pump
Is the calibration method and specifications known for any of that style pump? Just curious if that information had made its way into the public domain.

Cheers,
Neil

Pittsford, NY

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4 years 6 months ago #218899 by Rome K/G
Replied by Rome K/G on topic stuck plungers fuel pump
"There might be..... a little rust on the throttle"
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4 years 6 months ago #218906 by ccjersey
Dimension is 1.736”

D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time:D
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The following user(s) said Thank You: dylangw228

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4 years 6 months ago #218910 by neil
Replied by neil on topic stuck plungers fuel pump
What I meant was available specs for gear quadrant to injection event.

Cheers,
Neil

Pittsford, NY

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4 years 6 months ago #218912 by M00051
Replied by M00051 on topic stuck plungers fuel pump
ccjersey, Thank you so much, that's exactly what I needed! I suspect the torque on the 3/8 fine adjustment nut is around 35ftlbs. Vic

D4-7U
D6-9U

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4 years 6 months ago #218994 by oldbeek
Replied by oldbeek on topic stuck plungers fuel pump

ccjersey, Thank you so much, that's exactly what I needed! I suspect the torque on the 3/8 fine adjustment nut is around 35ftlbs. Vic

If you don't have a depth gauge micrometer, I did it with a dial indicating caliper.

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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