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Mknoxc



Member Since: 17 May 2021
Location: Sussex
Posts: 2

United Kingdom 2011 Defender 110 Puma 2.4 SW Zermatt Silver
V8 Compression Test
I have acquired a 1992 Rover V8 3.5 engine s/n 24G10456B. It came out of a fire truck so has not had a lot of use. I have performed a compression test on the cold engine and six of the cylinders were good at 120 psi (it’s 8.13 to 1), however cylinders five and six are 105 and 100 psi. I squirted some oil into the cylinders and now cylinder five is 120 psi and six is 110 psi.

My question is should I replace the piston rings in those two lowest cylinders that are 100 and 105 psi cold, or can I expect them to be OK when engine is warm?
Post #972120 23rd Nov 2022 10:47am
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tommac



Member Since: 03 Jul 2018
Location: devon
Posts: 26

United Kingdom 2001 Defender 110 Td5 DCPU Alveston Red
Do you know how long the engine has stood? If the comparison has increased with the addition of oil, then halves it will be ok; that said, if it were me, I would probably change the rings for peace of mind.
Post #998293 2nd Jul 2023 4:16pm
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Mknoxc



Member Since: 17 May 2021
Location: Sussex
Posts: 2

United Kingdom 2011 Defender 110 Puma 2.4 SW Zermatt Silver
Thanks for the reply. I ended up doing a full tear down and found all the pistons are worn. Also one bore is below limits (naturally the one with the lowest compression) so I’m going for a +10 rebore and new pistons to match. Cheers!
Post #1000833 19th Jul 2023 3:31pm
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