Bleeding Diesel 'H' engine and injector pump oil.

[davway]

OK, Diesel newb question here.

I have a 1979 HJ45 with the 'H' engine.
If it were to run out of diesel, how would i bleed the system of air?

Also, the repair manual i have says there is a oil level indicator (dipstick) in the injector pump (at the front end of the vehicle) to check th eoil level in the injector pump and it even has a picture of it.
I cant see it anywhere on my injector pump.
Does the 'H' engine injector pump need to have oil in it (like the manual says) and if it does, where is the dipstick for it?
It has a drain plug at the bottom of it, so i assume it does need the correct amount of engine oil to function correctly?

 

[lostmarbles]

...I have a 1979 HJ45 with the 'H' engine.
If it were to run out of diesel, how would i bleed the system of air?..

After adding diesel to your tank .....

• Open the bleed valve on the top of your fuel filter and operate your primer pump to force the air out until you have diesel (instead of air) up to that point.
• Close this bleed valve WHILE DIESEL IS STILL ESCAPING (at which time you can stop pumping the primer).
• Open the bleed valve on your injector pump and recommence pumping your primer pump to extend the diesel up to that point.
• Again, close this bleed valve WHILE DIESEL IS STILL ESCAPING.
• Get someone to crank your engine while you "crack" the fuel-line-connection-nut on the top of each injector in turn. (Closing each one when you see fuel escaping.)

Your engine will usually start while you're doing the last step. But continue doing that step anyway ... until the engine runs smoothly.

...Also, the repair manual i have says there is a oil level indicator (dipstick) in the injector pump (at the front end of the vehicle) to check th eoil level in the injector pump and it even has a picture of it.
I cant see it anywhere on my injector pump.
Does the 'H' engine injector pump need to have oil in it (like the manual says) and if it does, where is the dipstick for it?
It has a drain plug at the bottom of it, so i assume it does need the correct amount of engine oil to function correctly?

My Owners Manual said the same thing about the injector pump on my 1979 B - engine. But in fact my injector pump is pressure-fed with oil from the engine itself so it doesn't need its oil to be separately changed.

I suspect the same applies to you.


Here's the oil feed on my engine (red arrow):



See if you can spot the same thing on yours.

 

[davway]

Thanks for the in depth reply.
I think you are right about the pressure fed oil supply.
There is another hose from the block to the pump, just as you have pointed out.

Is the primer pump on top of the fuel filter canister or is it somewhere else?
I know it sounds like a stupid question, however, i dont have the factory hand book and the service manual is next to useless and makes no mention of the primer pump.

 

[lostmarbles]

...Is the primer pump on top of the fuel filter canister or is it somewhere else?
I know it sounds like a stupid question, however, i dont have the factory hand book and the service manual is next to useless and makes no mention of the primer pump.

Some models have them on the top of the fuel filter but I think yours should be mounted on the engine-operated fuel pump which hangs off the side of your injector pump.

Similar to this setup on my B engine:



If it look like this one, you unscrew the white nylon plunger until it pops up.

When it has "popped up" you can push it up and down to suck fuel from your tank and move it towards your fuel filter and beyond.

When you've finished using it, you push it down and screw it clockwise to "seal it" again.

This is the factory-original type pump and they are prone to leaking.

If it still has the ex-factory concertina-plastic cover it'll look like this:



(You lift off that cover to gain access of course.)

By the way ....These Bosch units are cheaper and better and require no "screwing-down-to-stow":



So if yours drips diesel when you operate it, I'd replace it with a Bosch unit if I was you.

 

[davway]

This is exactly the same as what i have, the factory concertina plastic cover.
AFAIK, it doesnt leak, but i havent really paid much attention to it.
At least i know what it is now and also how to bleed the system if i ever need to.
Thanks heaps!

Some models have them on the top of the fuel filter but I think yours should be mounted on the engine-operated fuel pump which hangs off the side of your injector pump.


This is the factory-original type pump and they are prone to leaking.

If it still has the ex-factory concertina-plastic cover it'll look like this:

View attachment 554655

(You lift off that cover to gain access of course.)

 

[roma042987]

Similar problem here where is the bleed for the injection pump. I have a b diesel

 

[lostmarbles]

Similar problem here where is the bleed for the injection pump. I have a b diesel

Hi Roma

I'm at "work" so I have got to use a computer and programs I'm not familiar with. But here goes with putting "pink words and a pink arrow" on an image I used earlier in this thread to show you what to look for:





PS. It uses a 10mm spanner ..... same as the bleed nipple on your fuel filter.

 

[NelsWels]

Thank you for all the detail here. This may help me also. However, first it seems I may need an entirely new mechanical fuel pump. My 80 H-diesel (HJ45, post August 1980?) is simply not getting fuel. Do these mechanical pumps go out? and if so is there anywhere you all recommend I look for one? I'm in the states, but I'm used to shipping parts from NZ and OZ. ideas?

 

[roscoFJ73]

Do you mean a new injection pump or a new feed pump? The feed pump is replaceable or rebuildable. There can be other reasons why the fuel is not reaching the pump.
Can you draw fuel to the pump with the hand pump?
Can you see fuel leaking anywhere from the fuel lines or hand pump area?

Generally fuel injection pumps lose pressure slowly, its unusual for one to work one day and not the next providing it is getting fuel.
When they are tired they are usually rebuilt which is perfect. I doubt you would find a new pump for a H engine now, but spares are available for decades .

I'm not sure about the H engine but the 2H has a oil pressure valve and if there is not enough pressure ,the engine will not start. Often the valve plays up.

 

[et3surge]

Great thread! Thanks to all that contributed

 

[relaxedcruiser]

Ditto - very well explained.

 

[relaxedcruiser]

Hi Tom,

having noticed some - maybe many of your posts over the years I was pleasantly interested to read this one about bleeding a H or B engine today - somebody dug it up.
Especially your very great and patient way to explain this rather easy task to someone who is new but willingly to learn made me think ...well written and - hey ...we are both here in NZ - So I would like to ask you were are you located ? Maybe we could meet up some day for beer, coffee or tea and chat a bit about old school vehicles. Something I really miss in my day to day conversations.
By the way I'm located between Whakatane and Opotiki at the Ohiwa Harbour.

Just wrote you this text as a pm but your inbox for them is full, so I post it here. Hopefully you'll notice.

Cheers Tilmann

 

[duncanrm]

Hi Tom,

I've always enjoyed Tom's posts as well.. unfortunately he hasnt logged onto mud since Oct 2020