Bennehboy
Well-Known Member
Reeto, just didn't know why the oil would turn black. I'll see what happens.
Reeto, just didn't know why the oil would turn black. I'll see what happens.
Bennehboy
Well-Known Member
Ah got it, cheers James.
I was going to give the entire head a parrafin bath once I'm happy with the seats and have popped the oil stem seals off.
jamesmartin
Well-Known Member
try it dry see what you get ,i presume stem seals are off already, when you hone a bore you would be surprised the amount abrasive /metal paste gets absorbed in to bores even after it looks clean ,something you have to be very particular about ,same with valve seats
Bennehboy
Well-Known Member
No the stem seals are still in, should I lap it with them off? I thought the valve might wobble more or something?
jamesmartin
Well-Known Member
they cant be a good fit if you can lap valves with them fitted, unless your lapping stick has an extremely strong sucker
jamesmartin
Well-Known Member
are they hardening
re lapping in valves. it seems theres quite a few different ideas floating around. when i did a motorbike head, which is an awful lot easier to handle than a td5 head. after each lap with fine paste. i held the valve in place and poured some parafin down the port until it did`nt leak out any more.
Bennehboy
Well-Known Member
I'm going to do something similar, cheers.
Bennehboy
Well-Known Member
Starting to come back together now....
Honed all the bores using a Flex Hone - brilliant bit of kit! Then washed them down with dish soap and hot water, and finally gave them a good oil:
The 4 extra new pistons arrived, so I wasted no time and got cracked on fitting them - forgot to take photos I'm afraid, but it's pretty simple:
1) oil everything up and fit to conrods with conrod front mark aligned to arrow on piston top
2) align ring gaps as per instructions, 120 degree apart avoiding thrust side.
3) fit piston into ring compressor
4) Remove big end cap and put to one side, oil the shells and make sure they are spotless
5) oil the bore and make sure it's spotless
6) oil the crank journal and make sure it's spotless
7) insert piston into bore and gently nudge down with wooden handle of hammer until it slips out of the compressor - if you meet resistance remove, reseat, check compressor tension (not too tight!), and try again
7) check the journals and shells are spotless again! apply judicious amounts of oil to wash any dirt away.
8) align conrod bottom with crank journal and push home
9) check big end cap is still spotless and fit to conrod ensuring correct orientation!
10) torque up, 20nm then 80 degrees.
11) Repeat for the other 4 pistons, rotating crank as necessary
Next job is refitting the oil pump/stiffener assembly....
Honed all the bores using a Flex Hone - brilliant bit of kit! Then washed them down with dish soap and hot water, and finally gave them a good oil:
The 4 extra new pistons arrived, so I wasted no time and got cracked on fitting them - forgot to take photos I'm afraid, but it's pretty simple:
1) oil everything up and fit to conrods with conrod front mark aligned to arrow on piston top
2) align ring gaps as per instructions, 120 degree apart avoiding thrust side.
3) fit piston into ring compressor
4) Remove big end cap and put to one side, oil the shells and make sure they are spotless
5) oil the bore and make sure it's spotless
6) oil the crank journal and make sure it's spotless
7) insert piston into bore and gently nudge down with wooden handle of hammer until it slips out of the compressor - if you meet resistance remove, reseat, check compressor tension (not too tight!), and try again
7) check the journals and shells are spotless again! apply judicious amounts of oil to wash any dirt away.
8) align conrod bottom with crank journal and push home
9) check big end cap is still spotless and fit to conrod ensuring correct orientation!
10) torque up, 20nm then 80 degrees.
11) Repeat for the other 4 pistons, rotating crank as necessary
Next job is refitting the oil pump/stiffener assembly....
Bennehboy
Well-Known Member
Started to clean up the stiffener plate bolts - these need to be threadlocked on so wanted to get them as clean as I could, parrafin bath, thread chased, blown off with air gun, then wiped down with blue roll:
Finished product, much cleaner:
So next the stifferner plate/pump goes back on after blowing out all the bolt holes:
This is the bit where you MUST IGNORE EVERYTHING THE HAYNES MANUAL SAYS!! Haynes says to use 23nm torque on the bolts, RAVE says 13nm so I went with RAVE after hearing of people braking bolts!
Both Haynes & RAVE say to replace an o ring under the pump to block housing, this o-ring was superceded by a metal gasket, so use this - you can just see it under the pump here:
All fastened up and with new screws & o-ring for the pickup (10nm for the pickup screws). I primed the pump with oil before fitting the pickup by the way:
New crank sprocket (15P type) fitted:
New locktighted oil pump bolt:
And to be extra sure a nord lock:
Pump chain cleaned, oiled, and fitted. Bolt torqued to 30nm ~25nm+20% due to nord lock (took this before bolting up oops):
New main chain on and aligned to timing mark:
New cam sprocket on, aligned to timing marks, set to roughly TDC and zip tied up:
Next job, refit timing cover and sump
Finished product, much cleaner:
So next the stifferner plate/pump goes back on after blowing out all the bolt holes:
This is the bit where you MUST IGNORE EVERYTHING THE HAYNES MANUAL SAYS!! Haynes says to use 23nm torque on the bolts, RAVE says 13nm so I went with RAVE after hearing of people braking bolts!
Both Haynes & RAVE say to replace an o ring under the pump to block housing, this o-ring was superceded by a metal gasket, so use this - you can just see it under the pump here:
All fastened up and with new screws & o-ring for the pickup (10nm for the pickup screws). I primed the pump with oil before fitting the pickup by the way:
New crank sprocket (15P type) fitted:
New locktighted oil pump bolt:
And to be extra sure a nord lock:
Pump chain cleaned, oiled, and fitted. Bolt torqued to 30nm ~25nm+20% due to nord lock (took this before bolting up oops):
New main chain on and aligned to timing mark:
New cam sprocket on, aligned to timing marks, set to roughly TDC and zip tied up:
Next job, refit timing cover and sump
Bennehboy
Well-Known Member
Binned the nord lock it was too small, should've ordered the large flanged version.
Timing cover back on:
Sealant in the right places and the sump gasket laid out:
Sump on - once again completely ignore Haynes, it states 45nm for the bolts, when in fact it should be 25!
Oil drain hose being connected with new gasket, 10nm torque for the nuts:
I appear to have a short engine!
Oops forgot the tensioner:
Timing cover back on:
Sealant in the right places and the sump gasket laid out:
Sump on - once again completely ignore Haynes, it states 45nm for the bolts, when in fact it should be 25!
Oil drain hose being connected with new gasket, 10nm torque for the nuts:
I appear to have a short engine!
Oops forgot the tensioner:
cambridgecockney
Active Member
Looking good.
