the engine compression does not effect the injector if you are get fuel or not but the engine compression dose effect if you want it it ignite the diesel fuel diesel ignite by the compression and by the cycle compressing the fuel and air so tight that the friction and compression kick the fuel off all low compression will do is puff out white smoke (unburned diesel) SEE on Hazts diesel which is the top of the line German industrial engine the piston goes up in to the head 2mm pass the block surface so that is way timing (it will knock out the valve) is important
on hazts they use a copper ring as a head gasket which i use some lead turn the engine by hand hit the lead then take it out to measure the thickness
hope the help some just remember you getting fuel or you are out of the pump or you might check to see if the pump is in the full open not close or half way close you need to have enough pressure out of the pump to pop the injector springs

I am not getting any fuel to pop the injectors. That is the problem, period. I have to time the injection pump and my fuel injection problem will be solved. I spent all day today hoping to see has anybody else seen what I saw about the inner workings of this 1987 300SDL Diesel. But I guess you have to have gone through that 603 engine backwards and forward like I've done to even know what I'm talking about. Several of the guys here are shooting in the right area, but none so far has said anything to let me know that they fully understand what is going on with this engine from an engineering standpoint.

BenzDiesel

**sigh**

No. An incorrectly timed pump will still squirt fuel - just at the wrong time. I asked before, and you did not answer, how long have you cranked the engine? Several minutes worth after buttoning up the entire fuel system - yes or no? And have you taken Casey's advice to remove the side cover and make sure the rack is moving out of the stop position?

BenzDiesel from what I have been able to get out of your posts is that you replaced the head. Then you bolted the IP back on with new delivery valve seals because they were leaking. Now you are not getting much fuel pressure to the injectors.

OK redo the seals if you have not already. If that doesn't do it remove the IP and have an injector shop go through it.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

benz, i ran into a situation on a 603 that may be some of your problem,i earlier gave up on this thread because of the bs and i am 64 years old and dont have time to go back and read all that has been discussed.
but i do remember you saying you had parked on a grade for an extended time, so there is a possibility that the check valve that is installed in the lift pump(fuel)has gone bad and letting fuel leak back to your fuel tank.
i was reassembling an older 615 engine and noticed that with the ip#1 port open for ip timming that i had a loss of fuel,i pump it up and fill the ip with fuel,dont touch nothing and down it woulg go,so the chevk valve wasnt holding and the fuel was getting sucked back to the tank. first one i seen to do that,but it could be happening to you.
if it were me i would start with a fresh battery,tighten everything up,crank till it starts or 45 seconds pass,clamp the rubber fuel line with a clamp(tank to primary fuel filter)let her set till my starter cooled off and repeat this process,would put a charger on my battery and sorta help it alone.
many ways to prove the check valve is bad but i am lazy and look for the easy way.
72 old cars