Author Topic: Crossley hd9  (Read 2882 times)

AUSDOK

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Crossley hd9
« on: 21 May, 2019, 10:23:57 am »
Hi we are nearly finished the engine .what we need to know is what id the distance from the end of the conrod to the centre of the crankshaft. We need this to work out if we need to put in a compression  plate. Regards Rudy

winnock

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Re: Crossley hd9
« Reply #1 on: 22 May, 2019, 11:06:09 pm »
Ausdok; The thickness of compression plates is usually determined by measuring the clearance between the piston and cylinder head at TDC. Known as the "Bumping Clearance" it is measured by placing a piece of led on the piston and measuring its thickness after the engine is turned over TDC. My instruction book for the HD9 engine make no reference to to this adjustment. Does your engine have any shims fitted. If not I suspect these engines may have been built to a tolerance that did not require adjustment by using shims.
Hugh
Diesel fuel injection equipment & vintage windmills.

cranky crank

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Re: Crossley hd9
« Reply #2 on: 23 May, 2019, 07:21:16 am »
It is also determined by if there is still a ridge at the top of the cylinder left by wear.Trying to push the piston over the ridge can have disastrous results.

AUSDOK

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Re: Crossley hd9
« Reply #3 on: 23 May, 2019, 06:21:18 pm »
Hi Hugh did the bump test and we need a 1/4" compression plate. Regards Rudy

cobbadog

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  • Buzacott Farm Pumper.
Re: Crossley hd9
« Reply #4 on: 24 May, 2019, 03:43:34 pm »
WOW that seems a lot, but having said that I know bugger all about these engines.
Cheers, John & Dee. Coopernook. NSW.

winnock

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Re: Crossley hd9
« Reply #5 on: 25 May, 2019, 05:19:33 pm »
It would be interesting to know what is normal with these engines. Any other Crossley owners out there who can give an idea how many shims are in their engine?
Hugh
Diesel fuel injection equipment & vintage windmills.

AUSDOK

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Re: Crossley hd9
« Reply #6 on: 26 May, 2019, 01:11:04 am »
Hi Hugh there are a couple overseas where we are trying to get info. We redid the bump test se eral times with different thickness of spacers. We will retest when we place the new spacers in. Regards

AUSDOK

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Re: Crossley hd9
« Reply #7 on: 26 May, 2019, 11:40:17 am »
Another factor in the need for a spa er is there was no bigend bearing or mains bearings these where made up from working out sizes from pictures. The big end was made a lite s.aller as we did not want to put the piston through the front end. All in all we did the best we could. Regards Rudy

AUSDOK

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Re: Crossley hd9
« Reply #8 on: 01 June, 2019, 11:14:17 am »
Put in a 6ml plate and the bump clearance is 140thou. Now we progress to the spray nozzel if anybody know what size holes sould be there. It would be appreciated.  Regards Rudy

winnock

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Re: Crossley hd9
« Reply #9 on: 05 June, 2019, 06:09:39 pm »
Finding a hole size for the nozzle will be hard without an old nozzle. I am going to make a guess it will be .35 to .40 mm or .013 to .015 in. Are you making a new nozzle?  The bumping clearance you have sounds a bit much. Have you got a ridge worn in the bore to go by as Crank Crank has suggested?
Hugh
Diesel fuel injection equipment & vintage windmills.

AUSDOK

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Re: Crossley hd9
« Reply #10 on: 07 June, 2019, 02:52:11 pm »
Hi Hugh we got the bump clearance by inserting a lead wire though the hole after the inlet valve was removed. A hard thing to do as it has to be fed around a couple of corners. But we are happy as the max clearance is 150 thou. We have the old nozzle but the center hole is larger than the other three. We got a fuel pressure of 140 psi. A work in progress.  Regards Rudy