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Cylinder head coolant elbow thread specs

  • shellsmith80
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7 months 6 days ago #17770 by shellsmith80
Cylinder head coolant elbow thread specs was created by shellsmith80
Does anyone know what the specs of the threads are for the coolant elbow on the bottom side of the 912ul cylinder head? This is the one that is Loctited and screwed in. On removal from the head the internal threads of the cylinder head have been slightly damaged and we would like to cut new ones but need to know the thread specs to find the suitable tool. It was removed as per the manual with heat and unscrewing but still the threads stripped. Any ideas?

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7 months 6 days ago #17772 by Roger Lee
Replied by Roger Lee on topic Cylinder head coolant elbow thread specs
Hi Shelley,
Sorry I don't have any info on the thread size. Rob might be the only one here that has or can get that info.
If you had to apply any pressure at all to remove the elbow and it didn't unscrew easily then it may not have been hot enough. It should just turn right out.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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7 months 6 days ago #17773 by shellsmith80
Replied by shellsmith80 on topic Cylinder head coolant elbow thread specs
Thanks Roger. Good to know for the future. Cheers. Shelley

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  • Bill Hertzel
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7 months 5 days ago #17774 by Bill Hertzel
Replied by Bill Hertzel on topic Cylinder head coolant elbow thread specs
The eight Cooling Water Elbows come in 45° and 80° flavors but they are all the same thread.

M18 x 1
The following user(s) said Thank You: Roger Lee

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7 months 5 days ago #17775 by Roger Lee
Replied by Roger Lee on topic Cylinder head coolant elbow thread specs
Thanks Bill.
Good to know.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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7 months 3 days ago #17778 by shellsmith80
Replied by shellsmith80 on topic Cylinder head coolant elbow thread specs
Yes thanks for that info Bill

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6 months 2 weeks ago #17904 by wizard
Replied by wizard on topic Cylinder head coolant elbow thread specs
I would like to add that Rotax sells a tool for this and it is listed in the IPC. The tap is a special "bottoming" tap, that means it is not as tapered as a standard tap, to get down to the last treads and clear out the old Loctite sealant.

The Rotax number is 877570 if you want to order one from a dealer.

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