Post by aussieal on Jun 5, 2020 6:36:54 GMT
My early P5 3 Litre Mk 1 has smoked up excessively and consumed lots of oil.
Body number is 631900045 engine No 631900048 making it a RHD export model (was it common for cars to be delivered without matching numbers?)
So I have removed the pistons to find broken compression rings on Cylinders 1,2, 5 and 6 and severe damage on piston 5
I then went to my donor motor 6319000187, only to find the pistons are completely different
The original piston has the following inscribed on the crown: TOP 002 TB RA2553 STD. The Donor piston has no such numbers just B and a peculiar symbol plus the cylinder number stamped on the top.
I presume that the original piston is factory fitted and that the donor motor piston is an after factory installation. Obviously it is not a suitable replacement. So I need to source a compatible replacement : any ideas?
The cylinder bores are in good condition with no scoring and an almost undetectable lip, so I see no need for a rebore. The big end bearings and the crankshaft also are in good condition. The big end bearings are stamped STD 2881 18AU82 R770 which again I presume are original factory fitted. However I thought that it would be a good idea to replace these whilst the motor is apart. Any comments from the experts please?
Having seen the condition of the bores and crankshaft and bearings, and coupling this with the minimal wear on the brake and accelerator pedals, it would appear that the 49270 miles on the odometer may be correct.
I have no history of the car but understood that it was shed stored for at least 16 years before I purchased and recommissioned it about 10 years ago. Being a bit impatient and a novice at these things I severely overheated after about 10 miles of driving on my first run. This was probably the cause of the initial damage which has now come home to haunt me!