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Perkins P3.144
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John426 View Drop Down
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Joined: 14 Aug 2012
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Points: 351 		Post Options Post Options   Thanks (0) Thanks(0)   Quote John426 Quote  Post ReplyReply Direct Link To This Post Topic: Perkins P3.144
    Posted: 04 Jul 2026 at 4:37am
On the Perkins 3.144, the injection pump is driven by a three-gear train. Timing and reassembly are straightforward; as a general rule, you simply align the marks on the gears. Very simple. It is on my D272 for i.e
On the pump itself, the gear is secured by three screws positioned in elongated slots. How do I determine the correct position within the slot?
Is there a reference mark indicating the alignment between this gear and the pump's drive shaft?
I am looking for the original factory marks—likely engraved on one of the components.
This is distinct from methods involving rotating the pump while checking for fuel flow at a disconnected injection line, or measuring piston heights.
CAV in-line injection pump.
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DrAllis View Drop Down
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Points: 23485 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jul 2026 at 9:26am
The CAV brand pumps I'm used to are similar to a RoosaMaster/Stanadyne pump. There is a rectangular cover on the side of the injection pump that has a "mark" on the inside that you align while the crankshaft is timed wherever it needs to be. Too bad there are no flat washer marks on those gear slots to refer to. In the end, usually you are located close to the center of the slot to be correctly timed.
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John426 View Drop Down
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Points: 351 		Post Options Post Options   Thanks (0) Thanks(0)   Quote John426 Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jul 2026 at 11:50am
I have this rectangular cover on the side of the injection pump. But i see no mark. I will check again. Not easy to see , there is a big distance between the gear and the shaft of the pump , and not to much space to see.





Edited by John426 - 04 Jul 2026 at 11:50am
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HudCo View Drop Down
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Points: 4225 		Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jul 2026 at 12:17pm
pretty sure the doc ment right on the injection pump its self  about a 5/8  x 1 1/4 cover two screws,    and you would line the marks in their then tighten down your three bolts   but i would see if their are some timing specs      am assumming the pump was removed and is put back on  zero  

Edited by HudCo - 04 Jul 2026 at 12:25pm
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DrAllis View Drop Down
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Points: 23485 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jul 2026 at 2:40pm
Yes. On the side of the injection pump itself. It will leak out fuel when you remove it.
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Jim.ME View Drop Down
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Points: 1007 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jim.ME Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jul 2026 at 4:56pm
That may be a Perkins injection pump.
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John426 View Drop Down
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Points: 351 		Post Options Post Options   Thanks (0) Thanks(0)   Quote John426 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jul 2026 at 2:16am
It is for this tractor my D272, with this pump. 
I don't see this smal cover on the pump 5/8 x 1 1/4
Where is it  ?
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Jim.ME View Drop Down
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Points: 1007 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jim.ME Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jul 2026 at 5:40am
That is an entirely different CAV pump than the ones the Dr was talking about.

There may be some info in the document on the site linked below.  It is a UK site and is about the BPE pumps.




Edited by Jim.ME - 05 Jul 2026 at 5:40am
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HudCo View Drop Down
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Points: 4225 		Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jul 2026 at 11:39am
any timing marks in side that round cap   may have to take the #1 fuel off and turn it until fuel starts comming up and see where your marks on the gears are also may need a degree wheel up front.    does that pump have its own advance  mechinizm ?  if not how many degres is it supossed to be?  
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