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Cylinder head coolant elbow thread specs

  • Shelley Smith
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1 month 1 week ago #17770 by Shelley Smith
Shelley Smith created the topic: Cylinder head coolant elbow thread specs
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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1 month 1 week ago #17772 by Roger Lee
Roger Lee replied the 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
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Tucson, AZ Ryan Airfield (KRYN)
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1 month 1 week ago #17773 by Shelley Smith
Shelley Smith replied the 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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1 month 1 week ago #17774 by Bill Hertzel
Bill Hertzel replied the 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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1 month 1 week ago #17775 by Roger Lee
Roger Lee replied the topic: Cylinder head coolant elbow thread specs
Thanks Bill.
Good to know.

Roger Lee
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Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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1 month 1 week ago #17778 by Shelley Smith
Shelley Smith replied the topic: Cylinder head coolant elbow thread specs
Yes thanks for that info Bill

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3 weeks 1 day ago #17904 by Rotax Wizard
Rotax Wizard replied the 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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