Compression Test

This forum is about the Fordson Dexta, Super Dexta and Petrol Dexta.
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Manta356
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Compression Test

Post by Manta356 »

Done a Quick Compression Test on a Standard Dexta. I Got 290 on no1 Cyl and 300 each on no’s 2 & 3. I Know the Manual States that the Engine Should be Up to Temperature when doing it but I had the Injectors Out and Done it On a Cold Engine
Is that a bit Light or would it be ok for a Tractor for Light Work. I will be Removing the Engine to fit Gaskets anyway as I’m going to Paint it so maybe I’ll have a better idea of Engine Condition when I get the head off. Oil pressure is around 25 psi when Up to Temperature

Billy26F5
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Re: Compression Test

Post by Billy26F5 »

25 psi is a bit low, should be 40. The compression seems all right, but all cylinders should be far more similar to each other.
Sandy
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Manta356
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Re: Compression Test

Post by Manta356 »

Redone the Compression test Today with the throttle open with the same results.
I then put a Little oil in the Cylinders and got 380 in 1 and 400 in the other Two.
So will have to check the liners,pistons and Rings when I get it Out.

Emiel
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Re: Compression Test

Post by Emiel »

Hi,

This looks quite like the situation I was in. Low oil pressure and low compression. I ended up with fitting new bearing shells. Was lucky to have the diameter of the crank within specs. Pressed out the old liners and had a grove made in the block so new finished liners with flange could be pressed in. After all a not too bad job with reasonable costs. I ended up with a good starting, nice running tractor with good oil pressure.

Depending on where you're located parts for these engines are really affordable and then a rebuilt is cheaper then finding a tractor with a healthier engine.
Best regards

Emiel

N 1937, E27N 1948, 8N 1948, E27N 1950, E1ADKN PP 1956, Dexta 1959, NH Clayson M103 1964

Manta356
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Posts: 12
Joined: Thu Sep 03, 2020 9:21 pm

Re: Compression Test

Post by Manta356 »

Depending on where you're located parts for these engines are really affordable and then a rebuilt is cheaper then finding a tractor with a healthier engine.
[/quote]

I'm Based in Ireland so Plenty Suppliers To Choose From. :clap:

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