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15A D342 fuel system questions

15A D342 fuel system questions

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OldRedTim
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My D8 has been converted to electric start. Should I see pressure indicated on the gauge at the injection pump when starting?

I did get it to run for about 2 minutes after replacing the cylinder head and a piston. It lost rpm and stalled. Seemed like it ran out of fuel.

I opened up the fuel filter that is next to the oil filters. I'm getting fuel there. I seem to be getting fuel to the injection pump. But one of the six pumps are not putting out fuel.

Are the pumps hard to replace? If it's stuck can it be removed from the injection pump easily and freed up?

I removed the inspection cover off the side of the pump and all the lifters and yokes are moving up and down as you turn the engine over.
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Sun, Jul 8, 2018 12:16 AM
Old Magnet
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Yes, you should see at least some pressure when cranking.
If the lifters and yokes are traveling they are doing their job. Might have a clogged fuel passage at that one injector especially if it's #6 at the end of the fuel gallery. They are easy to remove and replace but it's a good idea to have replacement seals on hand.
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Sun, Jul 8, 2018 1:36 AM
OldRedTim
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Reply to Old Magnet:
Yes, you should see at least some pressure when cranking.
If the lifters and yokes are traveling they are doing their job. Might have a clogged fuel passage at that one injector especially if it's #6 at the end of the fuel gallery. They are easy to remove and replace but it's a good idea to have replacement seals on hand.
[attachment=49775]IMG_20180708_201239855.jpg[/attachment][attachment=49774]IMG_20180708_201245729.jpg[/attachment]

In the first pic I have fuel at this filter. Enough that if I loosen the cap fuel comes rushing out. I've checked this twice now over the weekend.

In the second picture is another fuel filter housing. There is hardly any fuel in there.

Was hoping to hear it run this evening.
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Mon, Jul 9, 2018 9:22 AM
Old Magnet
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Reply to OldRedTim:
[attachment=49775]IMG_20180708_201239855.jpg[/attachment][attachment=49774]IMG_20180708_201245729.jpg[/attachment]

In the first pic I have fuel at this filter. Enough that if I loosen the cap fuel comes rushing out. I've checked this twice now over the weekend.

In the second picture is another fuel filter housing. There is hardly any fuel in there.

Was hoping to hear it run this evening.
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Attachment
Both the torque converter fuel supply filter (the one by the oil filters) and the engine fuel filter should be getting 15 psi pressure when operating. What does the torque converter charging pressure gauge and the fuel filter pressure gauge say? Have you checked/changed the filters in the engine fuel filter housing?
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Mon, Jul 9, 2018 10:16 AM
L364
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Reply to Old Magnet:
Both the torque converter fuel supply filter (the one by the oil filters) and the engine fuel filter should be getting 15 psi pressure when operating. What does the torque converter charging pressure gauge and the fuel filter pressure gauge say? Have you checked/changed the filters in the engine fuel filter housing?
Hello
Just a little comment, Some D342 engines in D8,s had a different fuel pump configuration.
I.e. the high pressure fuel lines to the cylinders were from the front of the fuel injection pump,
cyl 2 - 3 - 4 - 5 - 1 - 6 ???? I think. Your photo had me thinking.
Sorry if I am on the wrong track.
Best regards.
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Mon, Jul 9, 2018 12:01 PM
OldRedTim
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Reply to L364:
Hello
Just a little comment, Some D342 engines in D8,s had a different fuel pump configuration.
I.e. the high pressure fuel lines to the cylinders were from the front of the fuel injection pump,
cyl 2 - 3 - 4 - 5 - 1 - 6 ???? I think. Your photo had me thinking.
Sorry if I am on the wrong track.
Best regards.
I never checked the tourqe converter fluid pressure when I had gotten it to run. I do know the fuel pressure gauge on the side of the engine never showed pressure.

I've ordered new filters.
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Mon, Jul 9, 2018 8:22 PM
OldRedTim
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Reply to OldRedTim:
I never checked the tourqe converter fluid pressure when I had gotten it to run. I do know the fuel pressure gauge on the side of the engine never showed pressure.

I've ordered new filters.
The fuel transfer pump was known to give issues before. Is there a service kit available or a replacement?
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Tue, Jul 10, 2018 7:41 AM
Old Magnet
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Reply to OldRedTim:
The fuel transfer pump was known to give issues before. Is there a service kit available or a replacement?
That transfer pump is unique to the fuel torque converter 15A's. Part # 5H2787.
Not aware of any rebuild kit but Cat may still have individual parts for the pump. Usually you can recover some performance by resurfacing the pump cover and replacing the gears, depending on how severely worn the pump is.
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Tue, Jul 10, 2018 10:17 AM
d9gdon
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Reply to Old Magnet:
That transfer pump is unique to the fuel torque converter 15A's. Part # 5H2787.
Not aware of any rebuild kit but Cat may still have individual parts for the pump. Usually you can recover some performance by resurfacing the pump cover and replacing the gears, depending on how severely worn the pump is.
Just some additional info - NPR shows that pump being used on the D8H 46A s/n 1-3043 and D8 35A tractors.

If that is correct, here are some tractors that have been dismantled for parts. The one place in Utah shows to have 3 to fit the serial number range. Might be worth a shot anyway.

https://www.machinerytrader.com/listings/construction-equipment/dismantled-machines/list/category/4/construction-equipment/manufacturer/caterpillar/model/d8h

NLA from Cat, but you didn't want to buy it anyway - the last price they had on them was a hair over $3175.
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Tue, Jul 10, 2018 10:39 PM
OldRedTim
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Reply to d9gdon:
Just some additional info - NPR shows that pump being used on the D8H 46A s/n 1-3043 and D8 35A tractors.

If that is correct, here are some tractors that have been dismantled for parts. The one place in Utah shows to have 3 to fit the serial number range. Might be worth a shot anyway.

https://www.machinerytrader.com/listings/construction-equipment/dismantled-machines/list/category/4/construction-equipment/manufacturer/caterpillar/model/d8h

NLA from Cat, but you didn't want to buy it anyway - the last price they had on them was a hair over $3175.
It's been suggested to me to put in a electric pump between the tank and the lift pump. Should help greatly with priming.

Thought I'd have this thing running by now to clear and grade for my shop. Supposed to be delivered July 23....ugh!
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Wed, Jul 11, 2018 12:06 AM
ccjersey
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Until you have changed the filters and cleaned the filter housing, I would not give up on getting pressure. Those sock type filters can be very cruddy and the fuel pressure gauge reads the pressure AFTER the filters. There should also be a fuel pump pressure relief valve that could be damaged.
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😄
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Wed, Jul 11, 2018 1:50 AM
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