Isuzu 5.2 4hk1tc blown head gasket repair, info, and general tips. Pressurized cooling system was cause by leaking injector tubes.
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Isuzu NPR 5.2 Blown Head Gasket Repair
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I have a chance to get one of these trucks super cheap. it has low compression in two of the cylinders, that's all I know about it. It has the 4HK1 engine, its a 2007. What do you think it would be? Is it worth buying and fixing? Any advice would be greatly appreciated.
Hi Brad
I'll do a pressure test on the egr cooler tomorrow. How manny psi would be safe? Also do you know do u know the torque for the injectors? Thanks Brad
Hi Brad
I took my 5.2 Isuzu NPR cylinder head to a machine shop. They resurface it and install 16 valve guides. They did a pressure test and no cracks. I installed the cylinder head and it work good for about a week. Then it started pressuring the coolant. It's not mixing with the oil. Any idea of what's causing this? Thanks
Hi Brad
The torque the same even for the small 2 bolts at the rear? Thanks Brad
Hi Brad can you tell me if this torque is correct for 07 Izusu NPR 5.2 head bolts? 1) 72FT LBS 2) 108FT LBS 3) 30 – 60 Degree Also there are 2 10mm bolts at the rear of the head. Is the torque the same for the 18 blots 14mm and the 2 bolts 10mm? thansk
Do you know what's the average charge for a pressure test. Do you know what's the psi when they do the test?
Sorry for the late response. Non of the liquids are mixing and I think that the radiator hose is over pressure. I also change the cap on the radiator and still had the same problem. I have remove the cylinder head I don't see any cracks. What do you recommend me to do next? Thanks
Thanks for the video.
I assumed the head gasket blew on my 3.9l diesel in a 95 W4500 when I saw excessive pressure in reservoir. New head, gaskets, radiator rodded out etc. Put back together & ran great, bubbling in reservoir was gone & temp was perfect. 3 weeks of daily use & the temp suddenly spiked & pressure returned. It is now parked because it overheats terribly after 30 minutes of driving. Cooling system can't keep up with the level of exhaust heat coming in. Never saw water in oil.
I couldn't quite make out what you were describing the problem was in the beginning- 'brass inductors'?
Your thoughts please.
Do you have a link to download the manual?
I forgot to tell you that my truck is 07 Isuzu NPR 5.2
Hi I have a problem, I have coolant returning to the reservoir. What do you think it could be?