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Old 11-16-2016, 12:21 PM   #1 (permalink)
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pressure in radiator.. head gaskets?

My girlfriends '86 k20 burb with a turboed 6.2 is going through coolant. No leaks. The coolant appears to being pushed into the over flow bottle. It can be cold (over night) then if I start it and shut it off there is a ton of pressure in the radiator. Burb seems to run great. No coolant in the oil.
So I'm thinking it has a blown head gasket.
My first question is,, Roughly how long of a job to do both head gaskets? (assuming nothing else is wrong) Its a daily driver so I need to have an idea if I can get it done in 2 days. What head gaskets should I use? (felpro) Is replacing the head studs necesary?
Any pointers would be greatly appretiated.

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Old 11-16-2016, 12:38 PM   #2 (permalink)
1967KaiserM715
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If original head bolts then yes replace, they are a 1 time use item. As to time two nights may be fine, depends on how well you can pull apart exhaust bolts.

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Old 11-16-2016, 01:09 PM   #3 (permalink)
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If thats got A/C, I think even two days might be optimistic unless you are one hell of a mechanic and can work fast. I spent a week fighting with my right side manifold alone because a number of the bolts via corrosion were no longer SAE size....nor Metric. ( And no I've never actually had the heads off this yet and I dread that day coming.)

I'm a pretty good mechanic...but I usually grossly underestimate the time it would take (but only on this truck for some reason) because ole man Murphy has it out for me when he throws his law at me.
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Old 11-16-2016, 01:14 PM   #4 (permalink)
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Felpro head gaskets and you must replace the Head studs..
ARP head stud kit is recommended
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Old 11-16-2016, 01:54 PM   #5 (permalink)
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When I do it, I'll have 2 full days. It has A/C, witch does make the passenger side tight. I can only hope there isn't any other damage. As I said it runs great, with the exception of the rad pressure and haveing to keep putting coolant in it.
Another question... we are currently driving it, keeping a eye on the coolant. Are we going to damage any thing else? I would love to do the job this weekend, but cash and order time is tight.
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1983 K20 Silverado 4x4 Jcode6.2NA (soon to be turboed) sm465 4:10 reg/cab long bed Horrible radio
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Old 11-16-2016, 02:04 PM   #6 (permalink)
boneheaddoctor
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Check your oil and make sure its not milky. Coolant makes a very poor lubricant. Also would not drive it any more than neccessary...hot exhaust gasses can erode the head and block deck where the gasket is breached.
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Last edited by boneheaddoctor; 11-16-2016 at 02:06 PM.
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Old 11-16-2016, 02:25 PM   #7 (permalink)
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Excellent point boneheaddoctor. We've kept an eye on the oil and haven't noticed any contamination. I'm pritty sure it has been like this szense we got it. We were having this coolant problem even back in sept/oct when we took it to TX, but I didn't relise what was going on. I guess I should consider this a top priority and consider my self lucky.
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1983 K20 Silverado 4x4 Jcode6.2NA (soon to be turboed) sm465 4:10 reg/cab long bed Horrible radio
1986 Suburban 3/4ton 6.2w/banks turbo kit, 6"lift and 35's
Why does simple have to be so complicated?
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Old 11-18-2016, 11:34 AM   #8 (permalink)
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I did mine recently and didn't find it too bad of a job. Okay, one should consider I replaced the whole engine a bit over a year ago so the bolts came loose nicely. Make sure you have someone to help with the heads once you start pulling them off and putting them back.
Clean the valves while you're at it. That took me the longest, 6-8 hours per head.

Good luck! 👍

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Old 11-19-2016, 09:11 AM   #9 (permalink)
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Check out this thread...

https://www.dieselplace.com/forum/63-...alve-pics.html

JoeQ had one of heads off last year and posted a good way to help get the head off the motor. Using a good heavy broom stick or piece of pipe bolted to the head to help lift it. These heads are heavy, with nothing on them and no valves they weigh about 80lbs each.
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Old 11-20-2016, 10:54 PM   #10 (permalink)
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Well, I got the heads tore off today. Drivers side was fine. Passenger front cylinder was the problem. Blown head gasket, cracked piston, and a crack between the valves. I couldn't afford the ARP stud kit, so I went with FELPRO bolts and head gaskets. And I'm not proud, but shes going back togeather the way it is. don't have the time or money to do any more. It has a 6" lift, so I don't think doing the piston later will be a big deal? And I guess I'll either have to pull the parts motor head or find a good one.

Am I going to have issues with doing this? What should I axpect?

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1983 K20 Silverado 4x4 Jcode6.2NA (soon to be turboed) sm465 4:10 reg/cab long bed Horrible radio
1986 Suburban 3/4ton 6.2w/banks turbo kit, 6"lift and 35's
Why does simple have to be so complicated?
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