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Author Topic: Setting tappets cold  (Read 4928 times)
PBN
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« on: 10 April, 2013, 21:01:14 PM »

Hi Folks, after towing the truck home with a noisy engine I took the rocker cover off and found a broken rocker shaft. One bolt by the damage loose.No cam or rocker damage and clean break. The camshaft bearing cap thread is knackered so have ordered a set of caps and rocker shaft plus gaskets from milners.
Question is HOW DO I SET VALVE CLEARANCES COLD???
Been searching the forum for an hour now and plenty of references to 0.25mm hot but thats a pain for me with a new shaft.
Can i get away with 0.25 cold or is there a different figure to use.?
Cant even see it in the HOW TO section.   
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Mad4Life
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« Reply #1 on: 10 April, 2013, 21:03:49 PM »

you can set them to 0.15 mm cold,
I set mine that way but run the engine up to temp and double check them hot, but it does give you a starting point

mark
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PBN
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« Reply #2 on: 10 April, 2013, 21:11:13 PM »

Thanks for the quick reply. Problem is I have to get intercooler etc off and break all my seals on rocker cover to get to them again and I have loads of trouble getting a good seal. Plus it cools off so may not be reliable.
Is 0.15 good enough for my only gap check???
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barnstormer
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« Reply #3 on: 10 April, 2013, 21:21:46 PM »

you can set them to 0.15 mm cold,
I set mine that way but run the engine up to temp and double check them hot, but it does give you a starting point

mark

When you do your valve clearance check hot at 0.25 mm, have you found that you have to adjust the clearance at all?
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« Reply #4 on: 19 April, 2013, 15:13:52 PM »

I set tappets cold at 0.15mm and ran her up to warm. Took intercooler etc off and checked tappets - too tight. Had to open them all up to 0.25mm for hot setting.

I think next time I would cold set at 0.20mm. Hopefully with heat expansion that would equate to 0.25mm hot.

Thanks everyone for their help on this one.

PS When I put the camshaft caps on I couldnt turn the engine as they had locked it up even with all glow plugs out to reduce compression.
I seems that the caps are machined then the oil ways are drilled and cause a sligh burr. I milled them wiith fine emery cloth wrapped round a wooden dowl in the direction of shaft motion.
After a couple of attempts they freed up and all good so far.
Just changed the oil yesterday and ran a magnet through but no metal bits so alls good.
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nickburt
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« Reply #5 on: 19 April, 2013, 20:07:25 PM »

Set mine to .22 cold (next size feeler gauge down below .25 !!!  Fine hot and runs well.
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« Reply #6 on: 19 April, 2013, 21:11:10 PM »

you can set them to 0.15 mm cold,
I set mine that way but run the engine up to temp and double check them hot, but it does give you a starting point

mark

When you do your valve clearance check hot at 0.25 mm, have you found that you have to adjust the clearance at all?

I always find an adjustment necessary on at least half of them; but that's probably down to my error or temperature changes, as mentioned.  Haven't tried Nickburt's method yet.  So will try that next time I do mine.  Also, first running after adjustment, mine runs not quite right for say 50 miles; but then settles in nice with better power and better mileage(back to normal)- then just before adjustment.  In my mind anyway.

Bob
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