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Can't keep 9n ford running

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Dollar Bill
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Joined: 01 May 2008
Posts: 1042
Location: Keystone Heights, FL

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PostPosted: Wed Dec 13, 2017 10:49 pm    Post subject: Re: Can't keep 9n ford running Reply to specific post Reply with quote

J B wrote:
The compression would only come up to about 60 psi. Do you need the manifold on to check the compression.


No. Both valves are closed on the compression stroke so the manifold has no bearing on compression readings.

60 PSI isn't abnormal for a newly rebuilt engine. Compression will come up after the rings have seated.
 
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J B
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PostPosted: Thu Dec 14, 2017 5:40 pm    Post subject: Re: Can't keep 9n ford running Reply to specific post Reply with quote

Sorry Bill I hate to keep bugging you, but this tractor is driving me crazy. I button it up put in spark plugs, antifreeze and oil but it wouldn't start. Took a compression check and it would pump to 50 psi on all 4 cylinders but when you stopped cranking it would drop back to zero. It wasn't holding the pressure. Why is this pressure jumping around one minute it'll check 120 to 125 on all cylinders, then it would check 145 on 2 cylinders and 2 cylinders nothing. This compression has been all over the place. I have tried starting fluid and nothing. Any advice

Thanks Jerry
 
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Dollar Bill
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Posts: 1042
Location: Keystone Heights, FL

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PostPosted: Fri Dec 15, 2017 12:18 am    Post subject: Re: Can't keep 9n ford running Reply to specific post Reply with quote


Jerry, you're not bugging me - Very glad to help.

Erratic compression readings may be caused by two things. Faulty compression gauge or sticking valves.

Try another gauge for comparison.

Not sure of how you're doing the test so here's the steps that I follow:

Remove all 4 plugs.

Remove the breather hose & make sure the choke and throttle are both open.

Crank it at least 5 compression strokes or until the gauge stops moving.

Write down the first compression reading (that is the valve seating) then write down the reading after 5 strokes or when it stops increasing.

You should have two numbers for each cylinder. Then, add a tablespoon of oil to each cylinder & repeat the process, but you only need the final reading for each cylinder.

Number ONE: ___________ Valve Seating ___________ Second Reading ___________ With Oil


Number TWO: ___________ Valve Seating ___________ Second Reading ___________ With Oil


Number THREE: ___________ Valve Seating ___________ Second Reading ___________ With Oil


Number FOUR: ___________ Valve Seating ___________ Second Reading ___________ With Oil

Ford specs: 90psi min (dry) new 6:1 flathead engine is about 125psi.

Interpreting Results:
+10psi increase good engine
+20psi increase normal engine
+30psi increase worn engine. NO INCREASE burned or stuck exhaust valve.
 
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