Mk1 Pi engine rebuild

Show us the work you're doing on your Triumph 2000/2500/2.5.
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M5driver
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Re: Mk1 Pi engine rebuild

#11 Post by M5driver » Fri Mar 15, 2019 4:40 pm

Pictures
They keep disappearing!!!!!!!
The attachment P1030289.JPG is no longer available
P1030289.JPG
Chris Lennard Mem 1906
Triumph 2.5pi MK1 1969 Damson, tan interior
TRiumph 2.5pi MKII 1972 Mallard, black interior
BMW E34 M5 LE 47/50 Orinoco Green
VW Golf mk6 Bluemotion Black

Carboy0
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Re: Mk1 Pi engine rebuild

#12 Post by Carboy0 » Fri Mar 15, 2019 7:57 pm

Are they valve spring collets, or part of the Oil pump?
Chris

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johnnydog
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Re: Mk1 Pi engine rebuild

#13 Post by johnnydog » Fri Mar 15, 2019 9:17 pm

You'd be surprised what you find in the sump. When I put a magnetic drain plug in the sump of my S, at the next oil change, attached to the drain plug was a tapered cross head machine screw like the one located in the pedestal of the rocker shaft. Fortunately, when I removed the rocker cover, there was still one there. I can only assume that the one in the sump had been there since manufacture. Can't think of any other way it got there!
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1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red

M5driver
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Re: Mk1 Pi engine rebuild

#14 Post by M5driver » Sun Mar 17, 2019 6:03 pm

Well looking at the offending item it appears to be made of alloy where it came from don't know. The oil pump is intact if a little worn, the rotors being out of tolerance. I expected this the oil pressure was low when hot.
The attachment P1030292.JPG is no longer available
P1030292.JPG
The Pistons and rods are now out at some point a little dirt got to the bearings and all of the crank journals for the rods are slightly scored so a regrind looks like its on the cards. The mains look ok so far I sill have three to uncover.
Also removed is the front sealing block. I have a stainless replacement to go in from Jigsaw racing. The front engine plate removes as well. Crank end float was checked and just over tolerance so new thrusts should suffice. The piston rings are very worn no wonder oil consumption was on the high side, the oil control rings being particularly bad. So the shopping list has grown and the predicted machining costs have gone up. Back to work tomorrow so progress will come to a halt for a while.
Chris Lennard Mem 1906
Triumph 2.5pi MK1 1969 Damson, tan interior
TRiumph 2.5pi MKII 1972 Mallard, black interior
BMW E34 M5 LE 47/50 Orinoco Green
VW Golf mk6 Bluemotion Black

M5driver
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Re: Mk1 Pi engine rebuild

#15 Post by M5driver » Tue May 07, 2019 9:47 am

Well its been a while since the last posting. Since then the crankshaft has been reground 10 thou under size and balanced. The mains where oval and the big ends under size on of which was 2.5 thou too small. The flywheel has been re faced and balanced together with the clutch cover. I also had the sump and rocker cover cleaned up. Under all that muck and grease corrosion typical Triumph.
P1030308.JPG
Chris Lennard Mem 1906
Triumph 2.5pi MK1 1969 Damson, tan interior
TRiumph 2.5pi MKII 1972 Mallard, black interior
BMW E34 M5 LE 47/50 Orinoco Green
VW Golf mk6 Bluemotion Black

M5driver
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Re: Mk1 Pi engine rebuild

#16 Post by M5driver » Tue May 07, 2019 9:58 am

After these parts where returned the block and head have gone in for machining. The bores where tapered too much 2-3 thou difference top to bottom. The honing tool did not touch the top inch and a half of the bores. Also being done is chemical cleaning which the machine shop has had to send the block and head away for. I am hoping they are back soon or the engine will not be ready till later this year.

Anyway here is some other parts cleaned and painting started.
The attachment P1030311.JPG is no longer available
P1030311.JPG
Chris Lennard Mem 1906
Triumph 2.5pi MK1 1969 Damson, tan interior
TRiumph 2.5pi MKII 1972 Mallard, black interior
BMW E34 M5 LE 47/50 Orinoco Green
VW Golf mk6 Bluemotion Black

johnnydog
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Re: Mk1 Pi engine rebuild

#17 Post by johnnydog » Tue May 07, 2019 12:05 pm

Are you getting them powder coated Chris?
I have just had a rocker cover bead blasted due to minor surface corrosion and powder coated in silver - £20 all in. Not worth attempting myself and it looks like new!
Register Member no. 1596

1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red

M5driver
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Re: Mk1 Pi engine rebuild

#18 Post by M5driver » Wed May 08, 2019 2:03 pm

I am aiming to spray it myself John. The sump and timing cover have come up ok considering they are now 50.
The timing cover is now assembled with a new tensioner and oil seal.
Chris Lennard Mem 1906
Triumph 2.5pi MK1 1969 Damson, tan interior
TRiumph 2.5pi MKII 1972 Mallard, black interior
BMW E34 M5 LE 47/50 Orinoco Green
VW Golf mk6 Bluemotion Black

M5driver
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Re: Mk1 Pi engine rebuild

#19 Post by M5driver » Sun May 19, 2019 6:17 pm

Been busying myself in the garage for a few days painting the block and head. Checking the oilways are clear of debris in the block.
The head has been assembled with new valves/springs etc. I did find the oilway at the back of the head although thoroughly washed and acid dipped it was still gummed up. This has now been rectified. one piston has been trial fitted in a bore to check clearance. All looks good. A few of the rings have been checked for gaps. These are new Hastings rings, I have found that the spacer for the oil control rings does not butt other than this the first two sets I tried were nearly right. The gap has a slight taper.I don't know if this is correctable as yet the taper is about 1 to 1.5 thou.

Anyway here is a picture of the head.
P1030314.JPG
Chris Lennard Mem 1906
Triumph 2.5pi MK1 1969 Damson, tan interior
TRiumph 2.5pi MKII 1972 Mallard, black interior
BMW E34 M5 LE 47/50 Orinoco Green
VW Golf mk6 Bluemotion Black

johnnydog
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Re: Mk1 Pi engine rebuild

#20 Post by johnnydog » Sun May 19, 2019 9:54 pm

Have you resorted to cycling whilst the PI is in the garage Chris?? :lol:
What colour did you decide for the block?
Register Member no. 1596

1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red

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