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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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Default Re: No compression

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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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.......................
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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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Old 03-19-2013, 10:06 AM   #21
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Default Re: No compression

I am with those who are siding on the valve problem. I would recommend an entire valve job since you are going to have to remove the heads to "clean" them anyway.

If I recall, since it has been a long time since I lifted valves out of my V-8, you will likely have to remove the manifolds, as well.

You will need a valve lifter. It is a special tool that compresses the valve spring while you lift out the valve itself from the block.

You can use the present valves so long as when you grind away the carbon deposits, you don't reduce any valve tolerance. Otherwise, go on ebay and find a set of valves...They are likely there.

Btw removing the heads you can also inspect the piston heads as well. This will tell you if the engine has ever been rebuilt. You may see a .40 stamped on the heads of the pistons. If I remember correctly, this means the cylinders were bored out 40 thousands over the initial bore. You would need this information if you replace the piston rings. Do everything that you can while the heads and manifolds are off, you won't regret it.

Btw, be sure to remove the head bolts in the series recommended by Ford. You should get a Ford manual for this since if you don't remove and put them back in the proper sequence, along with the proper torque, you will likely ruin all of your hard work.

Here is a link for the engine manual:

http://www.amazon.com/Complete-Ford-.../dp/1884089119

Here is an illustration of the V-8 FLathead:

http://restoreyourford.com/v860parts.shtml

Good luck
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Old 03-19-2013, 10:12 AM   #22
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Default Re: No compression

OK, no valve covers, I get it. (I am used to a 4 cyl Model A engine, so lost my perspective a little there) Then take off the intake manifold and look for the valves under there. The point is: look to see if the valves are moving freely with FULL travel. they might be stuck open as several have suggested.
-Denver
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Old 03-19-2013, 10:20 AM   #23
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Default Re: No compression

My two cents worth, you may be chasing your tail if you don't remove the engine and inspect it thoroughly. If it sat for 9 years there may be pistion ring and lower end problems that will appear shortly and become costly if not corrected.

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Old 03-19-2013, 10:28 AM   #24
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Default Re: No compression

I agree with the guys saying it's a valve issue. Hey, 9 years and you have some stuck or sticky valves.

I'd want to pull the top end myself (intake, and heads). Then you can get a good look at what you have and which ones are sticking. Hit the valve guides with MMO or whatever solution you prefer and work the valves that are stuck but tapping them in with a softhammer and turning the engine over to raise them up. Time is an essence, and it will take some time and some oil. Best to soak as long as you can stand to let it alone. Couple days.

100psi on a few cylinders is good for a flathead that has been sitting for a decade. So it sounds like you might have a good runner once the valves are free.

Best of luck.
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Old 03-19-2013, 10:32 AM   #25
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Default Re: No compression

Quote:
Originally Posted by ford1948f1 View Post
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.
You have removed the heads and intake, and the valves are free. Then you post again, saying "valves seem to be fine". Tell us in the finest detail you can, just what the valve seats look like. Any rust, particle build up, crud, etc.
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Last edited by Rock Hornbuckle; 03-19-2013 at 10:34 AM. Reason: spelling
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Old 03-19-2013, 10:48 AM   #26
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Default Re: No compression

Quote:
Originally Posted by ford1948f1 View Post
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.
Where have I heard "it ran when parked" before?

Sorry for the jab. Seriously, it sounds like a valve job is in order. You may not even have to replace any parts, but you do need to disassemble, inspect, clean & fix anything that needs fixin'.

Pull the heads and manifold off. Rotate the crank and see what you can see.
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Old 03-19-2013, 10:50 AM   #27
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Default Re: No compression

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Originally Posted by Mike51Merc View Post
Where have I heard "it ran when parked" before?

Sorry for the jab. Seriously, it sounds like a valve job is in order. You may not even have to replace any parts, but you do need to disassemble, inspect, clean & fix anything that needs fixin'.

Pull the heads and manifold off. Rotate the crank and see what you can see.
Mike, he's already pulled the heads and intake.
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