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Old 03-18-2013, 08:12 PM   #1
ford1948f1
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Default No compression

Hi everyone, I have a 1948 ford f1 v8 flathead with no compression on 4 cylinders. I have removed the heads and intake and valves are free, what could cause this. I was told from Previous owner that the truck was running fine with no problems but due to his health condition he had it park for 9 years.
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Old 03-18-2013, 08:20 PM   #2
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Default Re: No compression

Are the 4 cylinders on the same bank?
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Old 03-18-2013, 08:51 PM   #3
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Default Re: No compression

No 2,5,6,7 no compression
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Old 03-18-2013, 09:01 PM   #4
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Default Re: No compression

One on passenger bank and three on driver's bank. Engine sat for 9 years. What do the valve seats look like, and what is the compression, zero?
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Old 03-18-2013, 09:14 PM   #5
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Default Re: No compression

You have to move air to get compression, could it be plugged intake or exhaust?

Bill
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Old 03-18-2013, 09:27 PM   #6
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Valves seem to be fine, the gauge just moves up and down from 0 to 5 psi, I was trying to start it all i would get was backfire threw the carb, I rebuilt the carb.
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Old 03-18-2013, 09:29 PM   #7
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Default Re: No compression

How could I clean the valves?
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Old 03-18-2013, 09:33 PM   #8
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Default Re: No compression

Hi, Not a motor guy, but if the valves are happy then the rings would be the next likely culprit. I assume you're getting a good fit on the compression gauge.

-VT/Jeff
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Old 03-18-2013, 09:54 PM   #9
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Default Re: No compression

Give us the readings on all 8 cylinders.
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Old 03-18-2013, 10:05 PM   #10
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Default Re: No compression

Cylinder 1 100 psi
Cylinder 2 0 psi
Cylinder 3 95 psi
Cylinde 4 95 psi
Cylinder 5 to 7 0 psi
Cylinder 8 90 psi
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Old 03-18-2013, 10:25 PM   #11
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Default Re: No compression

It would seem that your gauge was working, therefor most likely it is the compression rings that need to be replaced. Mic the cylinders, check for wear. You may need to rebuild the engine if the cylinders are worn. How many miles on the engine?
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Last edited by Rock Hornbuckle; 03-18-2013 at 10:26 PM. Reason: spelling
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Old 03-18-2013, 11:38 PM   #12
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Default Re: No compression

The valve has to mate properly in the valve seat (NO rust or corrosion anywhere)
and make sure the valves arn't burned or compression cannot build.







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Old 03-19-2013, 01:23 AM   #13
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Default Re: No compression

After sitting so long without running there is a good chance the valves are stuck due to rust and corrosion. I am not familiar with flat head V8's but i assume there is a valve cover on the side of each bank. If so, remove the covers, turn the engine over and see if the valve stems are moving freely. That may reveal the pproblem.
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Old 03-19-2013, 07:52 AM   #14
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Default Re: No compression

Zero compression indicates open valves more than bad rings. Bad rings will generate at least some compression.
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Old 03-19-2013, 08:48 AM   #15
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Default Re: No compression

Quote:
Originally Posted by denver9 View Post
After sitting so long without running there is a good chance the valves are stuck due to rust and corrosion. I am not familiar with flat head V8's but i assume there is a valve cover on the side of each bank. If so, remove the covers, turn the engine over and see if the valve stems are moving freely. That may reveal the pproblem.

valve covers ...!!!! rocker-arms? Maybe check the ECM, just a thought.
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Old 03-19-2013, 09:01 AM   #16
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Default Re: No compression

most likely carbon under the valves..pretty common condition....hand rotate the engine ,when each valve is at its highest.a tooth brush type wire brush with a little kerosene or diesel fuel scrub the seats in the block and each troubled valve..clean them up and ck compression again..if the compression improves,you might get away with lapping the valves....poor fuel,,short trips doesnt heat the engine enough to burn off the carbon..on and on!
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Old 03-19-2013, 09:17 AM   #17
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Default Re: No compression

Those valve covers must be collecter items. Henry Ford is still looking for them. LOL Walt
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Old 03-19-2013, 09:20 AM   #18
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Default Re: No compression

ARDUN.......................
Paul in CT
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Old 03-19-2013, 09:42 AM   #19
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Default Re: No compression

What's a valve cover?
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Old 03-19-2013, 09:47 AM   #20
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Default Re: No compression

Valve train seems to be where problem lies is.You should always have the correct valve in the compression tester as a tire valve is incorrect.Tire valve is not sensitive enough.

R
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