1973 Series III - Compression Test - Defender Source
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  #1  
Old October 4th, 2014, 06:18 PM
LRColorado
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John
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1973 Series III - Compression Test

I recently purchased a Series III 2.25 Petrol.

No one has touched the engine in years. I did a compression test and got the following results:
Dry Test - Valve 1: 88 Valve 2: 91 Valve: 90 Valve 4: 50
Wet Test - Valve 1: 81 Valve 2: 80 Valve: 81 Valve 4: 70

Shouldn't the wet test be a higher compression than the dry test? What needs to be done to the engine based on these results?

Thanks for your help,
John
Denver, Colorado USA
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  #2  
Old October 4th, 2014, 07:33 PM
LRColorado
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John
1990 Defender (200 TDI)
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Few more items to mention:
1. The plugs were very black when I did the compression test and looked like a lot of carbon build-up
2. It idles very smooth with the occasional slight popping noise. My dad held a dollar bill to the exhaust pipe and it does suck it in and out.(not sure what this means)
3. The exhaust is bluish in color and seems to be constant - accelerating off a full stop I leave a billow of smoke for half the block
4. I am not loosing coolant and I don't see any white foam in the oil.
5. Oil is being blown out the pipe in the engine compartment that you fill it up with oil.
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Old October 9th, 2014, 07:27 PM
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Niall Johnson
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Never seen #s drop after squirting oil in cylinder. #4 being significantly low would lead me to suspect bad exhaust valve. IMO you really want to see triple digit compression, if not add new rings and a hone.
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  #4  
Old October 9th, 2014, 08:24 PM
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Julien Dalbin
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How hard it blows thru the oil filler when engine is turning ?
That alone should tell you if you need new rings.

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