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Mk1 Pi engine rebuild

Posted: Thu Jan 03, 2019 9:20 pm
by M5driver
After many years of service the original engine for my Mk1 Pi is out for a rebuild. The reason being it was rather smokey and leaking oil and probably down on power.So far the rocker shaft has been removed and dismantled.
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If you can see most of the flats for the oil feed holes have worn away. So this needs replacing. After wiping the shaft down there were also some ridges where the rockers ran . Also all of the rockers themselves are wearing through the hardened surface. these will also be replaced.
All the head nuts have been removed and in the process two of the studs came out as well. As far as I am aware this head has never been off since Triumph put it together. I have had a look at the push rods and the face bearing against the follower has worn equally I must say they are not bad for an engine that has covered around 115000 miles.

The next job is to get the head off the block and assess the state of the valves, seats and guides. When this has been done I can then get the reminder of the engine on the stand for the rest of the disassembly.
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Re: Mk1 Pi engine rebuild

Posted: Fri Jan 04, 2019 5:27 pm
by Tinsmith_Skippy
Hello Chris happy new year to you. Looking forward to reading future posts on your engine rebuild. I’m going to have to rebuild my Pi engine as wel. It was well seized up, had to knock 3 seized pistons out off the block. Probably going to be a rebore than a honing procedure due to rust pitting in the liners. All the best.

Re: Mk1 Pi engine rebuild

Posted: Sun Jan 13, 2019 8:16 pm
by M5driver
<r>The head has been removed with much heaving and hoeing. My back doesn't like it. But it came off without too much brute force. The valves and springs have been removed have been removed. I have checked the valve stem movement in the guide. All the exhausts move excessively the inlets are not so bad. But all will be replaced I think.<br/>

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All a bit rich but the car was being moved around the yard when the engine was last run.<br/>
All the valves out the usual carbon build up.<br/>

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Here is a closer shot. Not bad considering its the first time apart.<br/>

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Finally a shot of the bores not a great one the lighting is not the best.<br/>

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The next task is to get the engine onto my stand. A crane is required and I may have to borrow one. Have a busy week at work so not much can be done now for the next 6 days.</r>

Re: Mk1 Pi engine rebuild

Posted: Sun Jan 13, 2019 8:19 pm
by M5driver
Sorry the pictures did not load up. Damn computers.
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Re: Mk1 Pi engine rebuild

Posted: Wed Jan 23, 2019 1:01 pm
by M5driver
Well have tried editing the posts to put the pictures back in no luck I can only seem to post one per reply.

Anyway now the timing gear is off cam and followers out. No signs of wear to the cam or followers. the timing chain is worn so is the tensioner, also the crank sleeve was turned around due to being scored by the oil seal. I have seen this many times in the past, so will be replaced.

Anyway here is a pic of the worn rockers again.