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Diesel Leak from Fuel Pump BMC 1.5


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#1 routrax

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Posted 07 May 2012 - 08:18 PM

Hi,
I've got a diesel leak coming from the plate that the return pipe comes from (see pic)
Posted Image
Initially I thought is was the return pipe itself so replaced that but is seems the leak is coming from the the gasket between the plate on the pump and the plate itself. There is a small amount of the rubber gasket poking out where the leak is and I'm guessing this this is probably the cause.
My concern is that the bolts holding this plate are wired in and have what looks like a security tag crimped on.

Should I just cut the wire and replace the gasket or is this a specialist job?
The pump was new just over a year ago when I had the engine rebuilt.

Any help appreciated.
Thanks
Steve
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#2 Flyboy

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Posted 07 May 2012 - 10:22 PM

Hi,
I've got a diesel leak coming from the plate that the return pipe comes from (see pic)
Posted Image
Initially I thought is was the return pipe itself so replaced that but is seems the leak is coming from the the gasket between the plate on the pump and the plate itself. There is a small amount of the rubber gasket poking out where the leak is and I'm guessing this this is probably the cause.
My concern is that the bolts holding this plate are wired in and have what looks like a security tag crimped on.

Should I just cut the wire and replace the gasket or is this a specialist job?
The pump was new just over a year ago when I had the engine rebuilt.

Any help appreciated.
Thanks
Steve

Hi Steve, the bolts appear to be wire locked. Just cut the wire,replace the gasket and re lock with soft iron wire. Not a specialist job. If you PM me I'll send you some stainless aircraft locking wire if your stuck.
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#3 routrax

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Posted 07 May 2012 - 11:56 PM

Thanks Flyboy,
I'll try to have a look tomorrow evening weather permitting!
I should be able to get some lockwire in a local toolshop, but if I have trouble I'll PM you.
The gasket appears to be rubber, would you think it'd be ok to make one or would it be best to source an original part?

Sorry for all the questions, it's just that I know nothing about injector pumps!

Thanks again
Steve
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#4 Flyboy

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Posted 08 May 2012 - 07:05 AM

Thanks Flyboy,
I'll try to have a look tomorrow evening weather permitting!
I should be able to get some lockwire in a local toolshop, but if I have trouble I'll PM you.
The gasket appears to be rubber, would you think it'd be ok to make one or would it be best to source an original part?

Sorry for all the questions, it's just that I know nothing about injector pumps!

Thanks again
Steve



Hi Steve, I would source an original part if I were you. Try Calcutt boats or RCR, they should have spares.

Regards Ian
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#5 Tony Brooks

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Posted 08 May 2012 - 07:40 AM

Hi Steve, I would source an original part if I were you. Try Calcutt boats or RCR, they should have spares.

Regards Ian


Or any Fuel injection company - most major towns have one. Ask at a local garage or where they maintain trucks for contact details. It is just a straight forward hydraulically governed CAV DPA pump and things like gaskets will be fairly standard across the range.

I am almost sure that is just a plate with nothing below it that will jump out at you so as long as you avoid dropping any dirt, paint flakes etc. down the hole all will be straight forward.
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#6 routrax

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Posted 08 May 2012 - 08:12 PM

I am almost sure that is just a plate with nothing below it that will jump out at you so as long as you avoid dropping any dirt, paint flakes etc. down the hole all will be straight forward.


Thanks Flyboy and Tony, It was the bits jumping out that worried me the most!
I'll hunt for a a gasket tomorrow. Do you know of anywhere that would stock them to save me the usual daft question and answer scenario!
Thanks
Steve.

Edited by routrax, 08 May 2012 - 08:13 PM.

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#7 micky44

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Posted 08 May 2012 - 08:33 PM

How could you tell there was a diesel leak with all that oil and crude around everything ??
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#8 RobinJ

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Posted 09 May 2012 - 07:44 AM

I've got a diesel leak coming from the plate that the return pipe comes from ...
Initially I thought is was the return pipe itself so replaced that but is seems the leak is coming from the the gasket between the plate on the pump and the plate itself. There is a small amount of the rubber gasket poking out where the leak is and I'm guessing this this is probably the cause.
My concern is that the bolts holding this plate are wired in and have what looks like a security tag crimped on.

It is difficult to see from the photo, but is this not the feed pipe?
The way the pipe feeds in from the filter to the pump, means it is exposed to a fair amount of vibration, which either tends to fracture the pipe itself or crack the joint on the pump. The resultant fuel leak can spread fuel in almost any direction and make it appear to be coming from somewhere else.
If you are talking about the the pmump mounting to the block, make sure you check the poisiton when you remove it, as this could affect the timing.
There may be an adjusting plate cover which has a gasket, in which case this is less crucial as the nuts are wired simply to show no alteration to the adjustment has taken place.
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#9 Tony Brooks

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Posted 09 May 2012 - 07:48 AM

It is difficult to see from the photo, but is this not the feed pipe?
The way the pipe feeds in from the filter to the pump, means it is exposed to a fair amount of vibration, which either tends to fracture the pipe itself or crack the joint on the pump. The resultant fuel leak can spread fuel in almost any direction and make it appear to be coming from somewhere else.
If you are talking about the the pmump mounting to the block, make sure you check the poisiton when you remove it, as this could affect the timing.
There may be an adjusting plate cover which has a gasket, in which case this is less crucial as the nuts are wired simply to show no alteration to the adjustment has taken place.



No, its the return pipe. The feed pipe on a DPA is on the other end by the transfer pump.

Th photo makes me thing the olive on that pipe may be crushed and leaking because the "nut" looks as if it may be tightened hard onto the threaded boss on the plate.
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#10 routrax

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Posted 11 May 2012 - 03:32 PM

How could you tell there was a diesel leak with all that oil and crude around everything ??

Hi Micky, It was the small jet of diesel shooting out from the area marked 'leak' on the picture that gave me the clue. Most of the dirt is due to the area being covered in diesel. I will be giving it a good clean before I remove any parts though!

It is difficult to see from the photo, but is this not the feed pipe?
The way the pipe feeds in from the filter to the pump, means it is exposed to a fair amount of vibration, which either tends to fracture the pipe itself or crack the joint on the pump. The resultant fuel leak can spread fuel in almost any direction and make it appear to be coming from somewhere else.
If you are talking about the the pmump mounting to the block, make sure you check the poisiton when you remove it, as this could affect the timing.
There may be an adjusting plate cover which has a gasket, in which case this is less crucial as the nuts are wired simply to show no alteration to the adjustment has taken place.


It's definitely the return pipe, but this is not leaking, I replaced the pipe and olives a month or so ago as I thought his was the cause. I don't think I will need to remove the pump to replace the gasket.

No, its the return pipe. The feed pipe on a DPA is on the other end by the transfer pump.

Th photo makes me thing the olive on that pipe may be crushed and leaking because the "nut" looks as if it may be tightened hard onto the threaded boss on the plate.


It's not the olive Tony, I've already done this a few times, which is why the nut looks a bit ragged. This will get replaced along with the gasket as it's a bugger to get to!
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#11 routrax

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Posted 13 May 2012 - 07:38 PM

Well new gaskets (there are 2 types, cork and rubber) and a new return pipe and fittings on the way from Calcutt Boats. Here's hoping that all my diesel ends up in the engine and not in the engine bilge!

Thanks for all the help guys.

Steve
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#12 HappyBunny

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Posted 15 May 2012 - 01:28 PM

Have followed this thread with interest as I also have a leak from my BMC 1.5 fuel pump and would really value any advice/info before tackiling it. The leak is coming from the engine stop arm .... does anyone know if there is a gasket or seal in there ... and if there are any bits liable to jump out when we go in there .......


cheers,
bunny

Edited by HappyBunny, 15 May 2012 - 01:28 PM.

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#13 Tony Brooks

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Posted 15 May 2012 - 01:55 PM

Have followed this thread with interest as I also have a leak from my BMC 1.5 fuel pump and would really value any advice/info before tackiling it. The leak is coming from the engine stop arm .... does anyone know if there is a gasket or seal in there ... and if there are any bits liable to jump out when we go in there .......


cheers,
bunny



I think that it is sealed by an O ring in the shaft within the turret that also houses the governor. I am sure the turret will require removing (and hence the governor) with the governor piston and valve hanging down below it. Once you undo the two? securing screws (maybe lock-wired) the whole assembly will just lift off. Form then on it gets a bit more complicated because there are several different models of pumps fitted to 1.5s.

I can not in all honesty encourage you to try this yourself unless you are used to working with diesel injection equipment. Cleanliness is all and you may have an idle damper to reset.

Make sure the pointer on the triangular plate the pump bolts onto is aligned with the line scribed on the pump flange and then remove the pump and take it to a specialist for overhaul. All you need to do to time it when you refit it is align the scribed line and pointer. The drive has a master spline.

I suspect we will be seeing more of this. I forecast some time ago that the loss of sulphur in the fuel would allow seal to shrink back to their original size but because they are now worn would start to leak. Just replacing the one O ring is likely to be a temporary cure because another seal may well start leaking soon.

Please ensure that you instruct whoever overhauls the pump that you want new seals fitted that are compatible with the new fuel.
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#14 RobinJ

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Posted 15 May 2012 - 02:58 PM

I think that it is sealed by an O ring in the shaft within the turret that also houses the governor. I am sure the turret will require removing (and hence the governor) with the governor piston and valve hanging down below it. Once you undo the two? securing screws (maybe lock-wired) the whole assembly will just lift off. Form then on it gets a bit more complicated because there are several different models of pumps fitted to 1.5s.

I can not in all honesty encourage you to try this yourself unless you are used to working with diesel injection equipment. Cleanliness is all and you may have an idle damper to reset.

There is a seal behind the operating arm, but I have never taken this off, so not sure whether you can simply remove the lever to get at it!
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#15 Tony Brooks

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Posted 15 May 2012 - 03:04 PM

There is a seal behind the operating arm, but I have never taken this off, so not sure whether you can simply remove the lever to get at it!


That is what I am tying to remember. I have a feeling that either a small screw is withdrawn that retains the shaft in a groove or the shaft is retained by the governor assembly. However as there have been are several different designs over the years we can only speculate unless we know exactly which pump the OP has.
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#16 HappyBunny

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Posted 15 May 2012 - 03:41 PM

hmmm thanks for those comments .... I shall proceed with due caution and assistance .....
:cheers:
bunny
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