How long and safe way to warm up 1hz with no coolant?

[diesel69er]

Hey guys. got a couple questions for you -

1) looking to do a compression test on 1 of my 1HZ's tomorrow. Roughly how long does it take to get the engine up to operating temperature with no coolant in the engine, in a heated garage. Is there a safe way to do this? Maybe a laser heat gun to the side of the block or something?

2) if I can throw in another question off topic. The 1HZ doesn't start until I run power to the injection pump and hear it click as it should. That's great, however, when I cut power to the injection pump, the engine keeps running. Seems strange that it won't start until I Feed it 12v but won't shut off when I take it away? Thought that how these work, Am I missing something obvious?

thnx once again for any help guys...

 

[kbushnz]

I wouldn't run it for very long without coolant...
As the coolant also distributes the temp around the block....
You may end up with a hot spot...

As for the fuel solenoid..I have heard that they can get stuck open....The spring inside wears or the valve gets sticky and it wont shut off....

 

[jb BJ73]

Pretty good chance of cracking or warping the head if you run it without coolant or at least water in it. If you can just join the top and bottom hose outlets with some hose and fill it up with tap water to do the test. Just drain the water out afterwards if its going to be sitting for a long time, it will start to corrode parts of the motor without any inhibitor in it.

 

[diesel69er]

I wouldn't run it for very long without coolant...
As the coolant also distributes the temp around the block....
You may end up with a hot spot...

As for the fuel solenoid..I have heard that they can get stuck open....The spring inside wears or the valve gets sticky and it wont shut off....

thnx for the tip, and yeah i guess the solenoid must be stuck open. just seems to me that if it is, why won't it start unless the injection pump has power?

It would be nice if someone made a cable operated valve to shut-off airflow, that would be my fix of choice.

 

[diesel69er]

Pretty good chance of cracking or warping the head if you run it without coolant or at least water in it. If you can just join the top and bottom hose outlets with some hose and fill it up with tap water to do the test. Just drain the water out afterwards if its going to be sitting for a long time, it will start to corrode parts of the motor without any inhibitor in it.

yeah i was thinking of getting water in there somehow, as you probably guessed the engine is no longer in the truck. I suppose I could even hook the rad back up and fill it with water, block the heater hoses and maybe even wire a temperature gauge back up, no worries then...

--thnx alot!

 

[crushers]

you can run the engine for a couple / 3 minutes with no issues at all. this will get the engine warmed up for a compression test.
been doing this for decades with no side effects.
if you are concerned then go buy a infra heat gun and read the temps as it warms up.
remember, diesels are cold running engines unless you start throttling up.
fire it up
let idle for 2/3 minutes,
shut down
do compression test
done

 

[roscoFJ73]

Hey guys. got a couple questions for you -

1) looking to do a compression test on 1 of my 1HZ's tomorrow. Roughly how long does it take to get the engine up to operating temperature with no coolant in the engine, in a heated garage. Is there a safe way to do this? Maybe a laser heat gun to the side of the block or something?

2) if I can throw in another question off topic. The 1HZ doesn't start until I run power to the injection pump and hear it click as it should. That's great, however, when I cut power to the injection pump, the engine keeps running. Seems strange that it won't start until I Feed it 12v but won't shut off when I take it away? Thought that how these work, Am I missing something obvious?

thnx once again for any help guys...

When I had the same problem,I got an old mountain bike tube and cut it.Then I joined one end to the lower coolant inlet and filled the engine with water,then I fitted the other end of the tube to the upper coolant outlet.
I think I blocked off the heater in/outlets with some old hoses.

This allowed to me to get it close to operating temp,but obviously if it builds pressure,the tube will begin to swell.
If you preheated 10 litres of water and poured that in ,you wouldnt need to run it long.
You only need to get the pistons ,rings and bores warmed up.

But like Wayne says,at idle they do not get all that hot.

I would take the solenoid out and bench test it.Sometimes they need a clean,but I dont think they are all that expensive.

 

[diesel69er]

hey again guys, I didn't get a chance to do the compression test until late last week. I got lucky, 600psi+ for every cylinder! That's like a new engine so must be a very recent rebuild.
Also, now that the motor is out of the truck, the shut-off solenoid is working perfectly? don't think I'll ever figure that one out...

anyway, thnx again for the help guys The 1PZ is next, then the other 1HZ. Will lady luck come thru for me twice more??