oldstata

Kinda
It will pressurize the system if there is any bad parts hoses, radiator, water pump, intake,heater core, head gaskets
As it looses pressure you should see the coolant ( some times leaks are internal and you can see them but you will loose pressure )

billmerbach

I'm thinking this is my case one sec I find a picture of what I think I have

billmerbach

The compression leak causing overheating

oldstata

Bill is that a olds head gasket diagram ? Or generic?
But in any case yes, if you pressure test the system one if the cylinders should fill up with coolant.

oldstata

28CC13FE-82FF-4C61-9379-3F6E7B4CF690.jpg


I also bought one of the ebay snake cameras for 20 bucks I have used it to see head gasket leaking into the cylinders as well as bent valves just a thought

billmerbach

Its just a generic diagram showing the difference in head gasket leaks something I saw the other day doing some research granted ik that isn't the area its exactly gonna be at but it should help me in identifying. Oh and to Dave my oil I better drain her an save the oil cause it doesn't even have 10 miles on the oil

billmerbach

Yupp I have a similar tester

73aussie455

I had a head gasket go as in the diagram, 'compression leak to coolant', in my 4x4. Had me scratching my head until I asked the local radiator guy if he had any suggestions. Found it with a compression test, it had over pressurized the cooling system and blew it all out the reservoir overflow, several times.. No coolant found in the oil and the engine overheated at least once. Replaced the said gasket, coolant, oil and did a compression test on the motor. The vehicle is still running around 10 yrs later.
If that's indeed what you've done, I wouldn't worry too much. Have a beer and a sit down for a while.

MDchanic

He can't have a beer while we're watching... He's sixteen.

- Eric

billmerbach

Actually 17 I need to change that but I don't drink and never will I take my weightlifting too seriously

MDchanic

Cool.

Weightlifting definitely helps your focus and your patience.

And booze doesn't mix well with athletics (except for rugby, and softball, but only if you're over 45).

- Eric

billmerbach

haha so heres my plan drain oil fill cooling system with water and pressure test if it looses pressure quickly im immediately going to drain it and pull the heads

MDchanic

Sounds like a plan.

I would also recommend that if it loses pressure, you listen very carefully to see if you can hear the leak, in the oil fill tube, by the water pump, and in each spark plug hole (through a tube or a hose).

- Eric

billmerbach

Gotcha I'm Hoping I get lucky here by what I've came to so far as far as what's happening I have

Warhead

If it were me, 1st test I would put 100psi compressed air into each cylinder (like a leakdown test) while rad cap was off. I will bet dollars to doughnuts that you will find 1 cylinder leaking into the cooling system.
Make sure valves are closed and engine wont turn before you plug the air hose in!
JMO

billmerbach

I don't have the tools to do that lol I'm gonna change the head gaskets this weekend it does appear that is my problem but whenever I change head gaskets I do both at the same time

M-14

A cheap way to add compressed air to a cylinder is to gut a compression tester by removing the Schrader valve. Mine has a quick change connector that's the same as my shop air hose.

oldstata

If your going to do the head gaskets think about having the radiator check or replaced maybe water pump and t stat.

In the near future I would think about doing the timing chain as well

oldcutlass

This is the way I found my bad head gasket on the old 330. However I wasn't testing for that, I was replacing valve stem seals. Hooked to #6 and my feet got wet from water spraying out the radiator over flow. Off came the heads.

billmerbach

Timing chain doesn't have but about 2000 miles on it that's why I'm pissed I messed up a very good engine far too soon

rustyroger

The timing chain won't be touched when you change the head gasket(s).

Roger.

billmerbach

Ik

FMB42

Changing the head gaskets is probably a good idea no matter what in your case. Years ago I, being an idiot, badly overheated my (aluminum head/cast iron block) engine. It ran well enough afterwards, but I suspected that I'd damaged the head gaskt and/or warped the head (eng had ~ 80K miles). Yet, it still had good compression and a leak-down proved OK. So... I let it be. However, the gasket did fail about a year later, and when it did it pumped coolant into the oiling system (I was lucky to catch this before it wiped the bearings and/or hydro locked on me).

billmerbach

Yea my dad had a similarly similar prob never could figure it put but same symptoms as I'm having now

billmerbach

Well the bolts to the exhaust manifolds came out without any trouble so that's down tomorrow I do the rest and by the end of the day should have her back in running order

billmerbach

Well had some coolant passages that were blocked. Pulled h the heads and I am waiting on my friend who hopefully has me a valve spring compressor because valves are white

MDchanic

How white? Got any pictures?

- Eric

billmerbach

One is almost totally white and the rest have tarnish colors to them but I'm figuring while the heads are off do this now

MDchanic

REALLY white isn't good, but they may actually be okay.

I agree that it's good to pull the valves and check the guides and the seats while you've got the heads off, but they may be good to just put right back in

- Eric

oldcutlass

It's probably due to the headgasket. I agree check the valve guide seals as they are easy with the head off and inexpensive to fix.

MDchanic

To elaborate: A cylinder (and valves) that is taking in water will look unusually clean (and deposits on valves may be white).
Very white exhaust valves can also indicate excessive heat, usually from a lean mixture.

- Eric

billmerbach

Ok seals are replaced and heads are torqued down to 70 foot pounds got too dark so I couldn't finish it. Anyways leaving it sit over night and tomorrow morning gonna go out in the morning and finish torquing and installing everything else hopefully I have a runner tomorrow afternoon

oldstata

Did. You see a break in the gasket ? Were the heads checked were the warped

billmerbach

No break in the gasket heads were fine I do believe the coolant passages I was telling you about were my problem.

oldstata

Bill I think head bolts to block should be 80. It's been awhile so if some one knows for sure please chime in

billmerbach

That's what the book I have says but yes please someone correct me if I'm wrong

oldstata

Just looked in 442.com says 80

billmerbach

Thanks for checking for me but that seems a little low I would think

MDchanic

+1: 80 ft/lbs for 7/16" head bolts.

- Eric

oldstata

Wait tell others chime in that have a bit more experaince then I do with these motors 442.com isn't always correct