Question I have is how does one install the DB2 injection pump so that it is in the right order for fuel delivery (timing). Is it possible to have it 180 degrees out - still with pin in the slotted hole? My son put a new IP on his 1991 GM 6.2 but said he rotated the crank after he had IP off because he could not get holes to line up. Therefore if he rotated the lower crank 360 how does the IP pump know where it starts off? He has it all back together, has bleed fuel lines, filter, etc. Installed new fuel filter, and glow plugs. Also looked at return fuel line while pumping and there does not appear to be any air in the fuel. Truck just will not start. New IP was put on with the exact same place on timing line. Which happens to be basically the factory scribed line.

By the way the IP was replaced with a rebuilt one as the engine ran away (wide open). Son got lucky and was able to quickly shut it down by placing his jacket over the intake to suffocate the motor. Took the truck to local GM and they said pump needed replacement and would cost 3000 approx. Far too much for us so we did the job ourselves. Hopefully we can get it running again.

Sorry for the dumb questions. I am new to working on diesels and my son is also just learning. Thank you in advance for any help you can provide.

 

I answered this one already I thought,but yes when your son turned the crankshaft 1 turn the cam is now 180 degrees from where the IP wanted to be since it turns at 1/2 the speed of the crank.

So if all remained the same removing the IP from the driven gear and turning the crank 1 more turn should put things right.

I however would google search for the 6.5 diesel military manual and download it and then pull the frt off the engine to be sure that all the chain and gears were in time per the pictures in the manual.

Also inspect the balancer and drive pulley as well as replace the timing cover seal,check the timing chain and reseal or replace the waterpump.

 

Thank you racer55. We are going to open up the front today and properly align the gears by the timing marks. Then put back on the IP. Another question I have for you is how does the ip know what phase it is in? Does it matter when it is mounted? Given your information that it turns 1/2 the speed of crank does this mean it would turn 4 times to move fuel to all 8 injectors? Sorry if these questions are far to simple for you. Just want to make sure we do it right and get this thing running again.

 

The IP has a loacting pin in it's drive flange-that pin goes in the slotted hole in the driven gear.

The crankshaft turns 4 times for each stroke of the four stroke cycle but since it is a V engine 2 cylinders are in separte strokes at the same time.

As far as the IP goes I think it depends on the IP,since some are 2 plunger and some are 4?

The IP does turn as many times as the camshaft though.

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The IP has a loacting pin in it's drive flange-that pin goes in the slotted hole in the driven gear.

As far as the IP goes I think it depends on the IP,since some are 2 plunger and some are 4?

The IP does turn as many times as the camshaft though.

 

Having trouble finding standard main bearings for my '84 6.2. Any ideas ?

 

Look for standard mains for a 6.5-they are the same.

The 82 6.2 with the red block and 2 piece rear main is the unique orphan to the best of my knowledge.

 

Racer55 we have taken your advice and downloaded a manual for our 6.2. We have taken the front off the engine and put it back together. The timing gears are now aligned by the dots and the line on main crank is set at 0. IP was put back on at this stage. We put a new water pump on the engine with new gaskets. I have taken pics of what we have done with the gears and timing marks but not sure how to use them in a form. It also has new glow plugs, the New IP, new intake gasket and new fuel filter. All filters and lines have been cleared of air. There is good fuel pressure and compression has been tested and is acceptable. Problem is engine still does not start. We have a new starter and batteries as well and engine seems to turn over fine. We are getting frustrated and are looking for some suggestions to what we may need to do to get this engine to run again.

 

Plugged in the block heater?
Have you got 1 injector line loose to clear any air while cranking?
Does any smoke come out the exhaust?

To post pictures click the go advanced tab under the text screen and then scroll down to images and find and upoad your picture-when they shoqw that they are uploaded click post reply under the images links.

 

This picture shows the position of the crank when I reattached IP.

 

This picture shows the alinement of the gears. They are now aligned at the dots/marks on gears. IP was reattached at this point.