P3 Engine Replacement

P3 Engine Replacement

Postby Pendle » Mon Oct 15, 2018 4:18 pm

The engine is seized on my newly acquired P3 75. I am trying to free the engine, but at the same time will begin investigating potential for replacement. I have the opportunity locally to buy a P4 90 engine with transmission and overdrive. Would this fit a P3? What are the issues and considerations?

Thank you

Chris Young
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Re: P3 Engine Replacement

Postby Bernie Hurren » Wed Oct 17, 2018 1:39 am

Quite a few P3s in Australia are fitted with P4 engines. I have a 90 engine that I will be fitting to mine someday.
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Re: P3 Engine Replacement

Postby roverreiver » Sun Oct 28, 2018 11:30 pm

After 6 months of trying to free my p3 75 pistons back in 1987 I was advised to fill the bores with vinegar. Next morning they gave in to a large aluminium drift and a club hammer. The crankshaft was removed much earlier.
John Kirkland
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Re: P3 Engine Replacement

Postby roverreiver » Sun Oct 28, 2018 11:59 pm

Last year I replaced my P3 75 engine with a P4 90. Big job but the best thing I ever did. Now have greatly increased torque, fewer gear changes and smoother progress. My work limited to P4 engine, clutch, and 1950 Land Rover clutch release sleeve to enable use of existing good P3 gearbox and drive train. You could do same. Using full P4 drive train would mean reworking the gear change mechanism and possibly a different length prop shaft. Overdrive would be a significant benefit which I do not have. Happy to share my experience if it helps.
John Kirkland
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Re: P3 Engine Replacement

Postby Pendle » Mon Oct 29, 2018 1:12 pm

Thank you for the responses. I have been contemplating a scope similar to that described by John - leave the P3 transmission and drivetrain. Am I correct in assuming that the main considerations in replacing the clutch are the condition of the original and the (un)availability of spares for the original?

Thank you
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Re: P3 Engine Replacement

Postby roverreiver » Mon Oct 29, 2018 7:56 pm

Correct, even in the 1980s Rover clutches for the P3 were long obsolete and we were dependent on reconditioned items. Mine was rebuilt by the late and much lamented Richard Stenning, an engineer for whom I had great respect and who wrote substantial chunks of the P3 Manual published by the RSR. After 25 years this clutch was inclined to judder badly at critical moments when full power was required so the attraction of the Borg and Beck clutch available for P4s and Land Rovers was one factor in deciding to try the P4 90 engine. The
other was that the rebuild of my original engine (which had never been re-bored) was not entirely successful although entrusted to an acclaimed company. It always got me home but it was never a happy engine and after more than 20 years of coping with its foibles I finally lost patience with it. I bought the 90 engine blind on ebay withe idea of comparing the reconditioning costs of the two. In the event the 90 turned out to be an exceptionally good buy requiring little more than the freeing of some sticking valves and a decoke to get back on the road quickly. Fingers crossed. Richard Stenning put a 90 engine in his P3 75 and wrote up the process in Freewheel -copies available from the RSR librarian. His description of the work he did to modify the clutch release mechanism left me cold and I can only assume he did it that way because he could not get a 1950 Land Rover clutch release sleeve at the time. Mine came from Craddocks, Land Rover parts suppliers in the West Midlands.
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