Perkins D3.152 leaking injector pump

[Oversway]

My Perkins D3.152 is leaking pretty badly from the injector pump. Can anyone recommend an engineer who can overhaul and replace the o rings and seals in the injector pump please?

I'm located in the Burton/Derby area.

I'd have a go myself but it's a job Ive never undertaken before and the replacement seal kit looks pretty complicated!

[Tony Brooks]

It looks like a mechanically governed DPA pump (from Google images) and the typical way would be to take it to a diesel equipment repair specials because I doubt many boat engineers have the kit to set it up after overhaul. if you employ a local engineer, I fully expect him to take it off and do exactly the same, then refit it.

 

I don't know how the pump is timed on that engine, but if there is a scribed line on one "point" of the pump's mounting flange with a matching pointer on the engine then when replacing you just align the scribed line on the pump with the pointer by twisting the pump. Best check in the manual if you have one.

 

I would be interested in exactly where it is leaking from.

 

Edited to add, purely from reports here about their overhauled engines, I would, personally, avoid key diesels. 

 

 

 

Edited November 17 by Tony Brooks

[Oversway]

Thanks for the advice Tony. Yes it is a mechanical governed DPA pump. A Lucas CAV.

Seal kits are readily available as are exchange units all ready to swap over and go. There are also people advertising on e-bay who will overhaul your pump for a fixed fee plus parts.

I understand the theory of marking and locking the timing and the removal/reinstating the pump, but having never tackled this job before, I don't feel confident about removing and reinstating myself. Hence looking for a recommended engineer who could do this for me.

The whole area around the pump is wet with fuel, particularly the fuel regulator shaft (throttle) 

 

 

[Tony Brooks]

2 minutes ago, Oversway said:

The whole area around the pump is wet with fuel, particularly the fuel regulator shaft (throttle) 

 

 

That is often caused by cable "overthrow" when you set it to idle. The lever stops against the idle stop screw, but the cable tries to push it some more. This results in the lever shaft being pushed against one side of the O ring in the rectangular "top". I expect that O ring is well-worn, but make sure there is no overthrow when you refit the pump. Adjust the fitting on the end of the cable if required.

 

If it happened to me while out cruising then, not knowing the area, I would talk to Jannel. 

Telephone 01283 542718

Email inboxjannel@gmail.com

Address Shobnall Marina Shobnall Road  Burton Upon Trent Staffordshire DE14 2AU

[Oversway]

Thanks, I'll check the cable and adjust it if necessary. I have adjusted the idle stop screw recently, so you may be on the right lines!

I do know Shobnall Marina, thank you.

[Canal321]

A neighbour had good results with 'Diesel Bob' for a leaking BMC injector pump. 

 

www.dieselbob.co.uk

Edited November 18 by Canal321

[Oversway]

Thanks for all the advice. Ive studied the workshop manual for this engine and I'm going to have a go at removing the pump myself and take it to a diesel specialist. Then reinstall once its been overhauled. It doesn't look that complicated.

I'll document what I do and I'll post it on here.

[JohnB]

You will, I assume,  detach the timing gear via the access plate on the front timing cover and then pull the injector pump back leaving the gear itself in timing case.

Here are a couple of hints.

Pack the gap between the gear with rag so that an errant setscrew does not disappear into the works!

The timing gear "should" remain in mesh with the rest of its train BUT it is possible that the peg to support it may be damaged. (I think this is mentioned in some manuals) I made a wooden  chock to secure the gear on an engine where the peg was missing.

 

I hope that is clear otherwise please ask. 

Not to awkward a job to do if you can get a reasonable access to the front of the block.

[Oversway]

Thank you John B. Yes that is the procedure as outlined in the manual that I intend to follow. I've also watched a video where a guy removed the pump from a MF tractor with a Perkins engine.

You're correct, the test will be if I have  reasonable access between the engine bay bulkhead and the timing cover.

I'm not on the boat at the moment so I can't check. Fingers crossed?

Thank you for the hints and tips.

[Oversway]

On 23/11/2025 at 20:15, Oversway said:

Thank you John B. Yes that is the procedure as outlined in the manual that I intend to follow. I've also watched a video where a guy removed the pump from a MF tractor with a Perkins engine.

You're correct, the test will be if I have  reasonable access between the engine bay bulkhead and the timing cover.

I'm not on the boat at the moment so I can't check. Fingers crossed?

Thank you for the hints and tips.

There's actually plenty of room

 

[Oversway]

Thank you everyone for the advice.

The leak was traced to perished o rings on the pump throttle shaft.

I called a local diesel specialist who came out to me on site. In no time he had the pump apart and replaced the offending seals. Fantastic service and the guy certainly knew his stuff. ("Ive done thousands of these") I can thoroughly recommend them.

https://www.swadlincotediesel.co.uk/