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Old 01-29-2018, 04:13 PM   #1
Art Newland
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Default 8RT pulling the heads

I have one cylinder on the drivers side that only has about 30 psi. With oil in the cylinder it bumps up to 100. Something is wrong with the rings or maybe the bore is scored... time to look and see.
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Old 01-29-2018, 04:35 PM   #2
SofaKing
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Default Re: 8RT pulling the heads

What made you check?
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Old 01-29-2018, 08:40 PM   #3
Art Newland
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Default Re: 8RT pulling the heads

Quote:
Originally Posted by SofaKing View Post
What made you check?
Miss at idle.
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Old 01-30-2018, 08:01 AM   #4
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Default Re: 8RT pulling the heads

Did you squirt some oil in the cylinder and check the compression again. That may help you narrow down if it's a ring issue or not. If the "wet" pressure increases I would "think" rings. But if not it may be a valve not seating properly.
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Old 01-30-2018, 08:02 AM   #5
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Default Re: 8RT pulling the heads

Sorry...forgot what I had just read in your initial post...
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Old 01-30-2018, 10:23 AM   #6
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Default Re: 8RT pulling the heads

before you pull the head its nice to have some idea what to be looking at. a poor mans cylinder leakage tester: weld an air fitting to a broken spark plug base. put the cyl on top dead of compression stroke, hook up regulated air, 30-40 psi, and listen for the leakage. in the breather tube=rings, carb=intake valve, ex pipe=ex valve. have fun!
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Old 01-30-2018, 10:32 AM   #7
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Default Re: 8RT pulling the heads

Try dumping slowly a quart of auto transmission fluid down the carb at high idle. It is cheaper than marvel Mystery oil. If nothing else all the carbon will be gone . Dont do this in side. Dont ask how I know.
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Old 01-30-2018, 05:43 PM   #8
Art Newland
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Default Re: 8RT pulling the heads

Overall things don't look too bad. Has .080 over pistons, the bores look good, no ridge to speak of just a little carbon. I'd really like to get this truck in "daily driver" shape and be trustworthy so I've decided to pull it and give everything a good looking over. I have a light duty 3-speed to go in it as well and can do it all at the same time. #7 piston has a little chunk missing around the top... that can't be good.
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Old 01-30-2018, 05:50 PM   #9
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Default Re: 8RT pulling the heads

Could it be from a piece of broken ring that then flew out the exhaust?
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Old 01-30-2018, 06:22 PM   #10
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Default Re: 8RT pulling the heads

Is the cylinder with the damaged piston the one with low compression? One would assume so, but you know about ass/u/me.
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Old 01-30-2018, 08:23 PM   #11
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Default Re: 8RT pulling the heads

Quote:
Originally Posted by tubman View Post
Is the cylinder with the damaged piston the one with low compression? One would assume so, but you know about ass/u/me.
No, #5 is the low one, #7 (damaged) was 110.
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Old 01-30-2018, 08:45 PM   #12
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Default Re: 8RT pulling the heads

Fifty years ago, I would have buttoned that up and run it. Not these days.
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Old 01-30-2018, 09:50 PM   #13
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Default Re: 8RT pulling the heads

How true tubman, if I needed it to drive to work I'd never even have taken it apart! It actually went down the road pretty good. I think it's just time to take a good look inside, maybe I can breathe a little new life in the old girl.
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Old 01-31-2018, 07:29 AM   #14
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Default Re: 8RT pulling the heads

Looks a little like the 8BA I owned in 1964, when I drained the oil parts of rings came out. One of my Pistons looked worse than yours, I ended up replacing two pistons and a new set of rings, rod and main bearings, no problems after that.
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Old 02-18-2018, 09:40 AM   #15
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Default Re: 8RT pulling the heads

The other head and intake are now off. The RHS cylinder bank look pretty much like the LHS, the bores look good. The valve chamber doesn't look too nasty and I believe there are adjustable lifters in there.
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File Type: jpg valve galley small.jpg (95.4 KB, 261 views)
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Old 02-18-2018, 10:18 AM   #16
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Default Re: 8RT pulling the heads

It's not uncommon to find a broken ring on a piston. This can cause a groove to be worn in the cylinder wall due to combustion leakage that happens until the compression gets too low to even fire the cylinder.
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Old 03-02-2018, 10:02 AM   #17
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Default Re: 8RT pulling the heads

A couple more bolts in the transmission then out she comes!
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Old 03-02-2018, 10:47 AM   #18
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Default Re: 8RT pulling the heads

is your truck F1 with a 4 speed? we are going to change out another 4 speed for a syncro 3 speed. we even converted a closed drive 39 1 ton to open drive, a lot of work but well worth the effort for a good driver!!
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Old 03-02-2018, 12:50 PM   #19
Art Newland
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Default Re: 8RT pulling the heads

Mine has the crash-box 4 speed, T-59 I think? That was another reason for me to pull the engine. I have a nice three-speed with new syncros and bearings to go in as well. I suppose those 4-speeds were nice around the farm, but on the street they are awful!
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Old 03-03-2018, 10:22 AM   #20
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Default Re: 8RT pulling the heads

The deed is done!

What will I find in there? All good things, I hope.
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