Author Topic: Engine Tolerances  (Read 266 times)

Offline SimonHolyfield

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Engine Tolerances
« on: 10.01. 2019 12:13 »
Chaps,

I've completed the teardown of my 1955 Ariel FH engine, which will be rebuilt into its original 1958 form with the help of a new crank & flywheel, purchased with the help of this very forum.

Whats the best place to find the dimensions & tolerances I need for inspection?
cheers

Simes

'51 Square Four, '42 W/NG, '58 Huntmaster,  https://ariel-square-four.blogspot.com

Online chaterlea25

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1961 Super Rocket
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Online Greybeard

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Re: Engine Tolerances
« Reply #2 on: 10.01. 2019 16:37 »
If the FH is mechanically the same as the A10, and I believe it is, then this may also be useful: http://www.bsawiki.com/

Offline SimonHolyfield

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Re: Engine Tolerances
« Reply #3 on: 10.01. 2019 17:50 »
If the FH is mechanically the same as the A10, and I believe it is, then this may also be useful: http://www.bsawiki.com/

It is, though the FH doesn't keep pace with the A10 upgrades - it never got the thick flange barrel, for example. Until BSA gave all the A10's the large journal crank in 1958, you can think of the FH as a Gold Flash spec engine with different castings - the head, barrel, timing cases and even crankcases (I think) are different - though the crankcase may just be machined differently for the Ariel primary drive.

Anyway - many, many thanks for your help Gentlemen.

As you can see from the attached image, today I have been removing sludge trap plugs!
cheers

Simes

'51 Square Four, '42 W/NG, '58 Huntmaster,  https://ariel-square-four.blogspot.com

Offline Swarfcut

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Re: Engine Tolerances
« Reply #4 on: 10.01. 2019 18:16 »
 Simon... That is a class act, caught just in time and with the main bearing location on the flywheel cheek untouched  from new.

    YOU LUCKY MAN!!!!!

  Swarfy.

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Re: Engine Tolerances
« Reply #5 on: 10.01. 2019 20:23 »
Quote

As you can see from the attached image, today I have been removing sludge trap plugs!
Now that looks like a great way to get those plugs out!

Offline SimonHolyfield

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cheers

Simes

'51 Square Four, '42 W/NG, '58 Huntmaster,  https://ariel-square-four.blogspot.com