Author Topic: a32 engine blok  (Read 4974 times)

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Offline tom hoek

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  • douglas A32 terrier 1931
a32 engine blok
« on: 23 Oct 2011 at 20:23 »
hello everyone
 I'm tom, I'm from Enkhuizen in the Netherlands
 have a question about my engine block

 what's missing from the A32 engine?
 someone has the dimensions of the gears missing
 I would like to imitate them

 Thanks for the help

 Regards Tom hoek





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« Last Edit: 26 Oct 2011 at 08:57 by Dave »

Offline Doug

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Re: a32 engine blok
« Reply #1 on: 24 Oct 2011 at 00:40 »
Tom,

On the crankshaft would be the breather plate, spring, engine pinion (half the teeth of the cam wheel), and pinion nut (which incorporates the drive dog for the oil pump.)

You are missing the inlet cam and its spindle. These are identical to the exhaust. There is a plate that supports the outboard end of the cam spindles. It is held by three shallow head hex bolts (you have one) and nuts on the cam spindles.

Regards,
-Doug

[fix typo. 25Oct11. -Doug]
« Last Edit: 25 Oct 2011 at 16:30 by Doug »

Offline Dewey

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Re: a32 engine blok
« Reply #2 on: 24 Oct 2011 at 01:09 »
Tom -
In addition to the parts mentioned by Doug, I don't see any valve springs, retainers, adjusters or two valves in the front cylinder.

Dewey

Offline Alan Cun

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Re: a32 engine blok
« Reply #3 on: 25 Oct 2011 at 10:38 »
Yes Tom if I were you I would be advertising for a parts engine B29 onwards as most of the internals would suit your needs.

Alan

Offline Mike of Woking

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Re: a32 engine blok
« Reply #4 on: 28 Oct 2011 at 13:53 »
Tom,

You appear to be missing the crankshaft pinion (gear), the inlet camshaft and also the magneto drive gear. If you are a member of the LDMCC then you will be able to buy pre war spares from the club, or alternatively use you initiative and have some spares made locally in Holland.

You won't go far wrong if you copy the exhaust camshaft that you have in terms of a blank for the missing inlet camshaft, as it will have the same number of teeth. The cam profile should be the same for both inlet and exhaust.
As for the material, you would again need to check with LDMCC or I would suggest that you use a good quality carbon / alloy steel that can be heat treated post machining.

With regards to the pinion, you have most of what you need, as the crankshaft appears to be there, and this gear will be exactly half the diameter of the two camshaft gears, as it runs at twice the speed. The thickness of the gear should identical to the camshafts as should the gear profile. The crankshaft will confirm the dimensions of the enagagement, eg parallel or tapered hole and the dimensions of the woodruff key slot that you need to cut in it. Again this should be made out of a quality high carbon alloy steel.

As this is not a performance engine then you can simply adjust and set the valve timing by moving the gears one to another. Again the LDMCC should be able to help with the valve timing sequence from the library of drawings that they hold.

Lastly the size of the magneto drive pinion will depend on what magneto you have. Does it have one or two pick ups ? This will determine if it runs at engine speed or at the camshaft speed. If you have the magneto then you can work this out. Again the gear will effectively be a copy of either the crankshaft pinion or the camshaft pinion with the same number of teeth and profile. From the magneto that you have you will know what the engagement is. Most have locking tapered shafts. Material would be the same as the other gears.

The allignment of the gears will determine the need for shims and packing or the thickness of any boss at the back in particular on the magneto....

You will find it so much easier if you join the club and source the spares from them.

I hope this helps,

Mike

Offline tom hoek

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Re: a32 engine blok
« Reply #5 on: 31 Oct 2011 at 19:46 »

Hello all
 Thanks for the help and explanations
 I'll try to make a gear  :roll:
 And to search for the parts that I miss  :)

 Greetings from tom