5 replies to this topic

[Gremlin]

Does anyone know what the diameter of the bearing journals should be?

Thank you very much in advance

[Chappb]

I made some mandrels to press in my new cam bearings on my engine build and used these sizes: 1.6660" or 42.32mm for the biggest (water pump end) bearing, 1.6220" or 41.20mm for the middle bearing and 1.3730" or 34.87mm for the smallest (oil pump end) bearing. These are figures that i used by measuring the OLD cam bearing journal diameter, so i should think a new bearing journal would have a smaller I.D than these above so please don't take these figures for gospel. I don't know what you need the measurements for but if you're making some mandrels like myself then let me know and i'll measure the actual diameter of the tools i made.

[Gremlin]

Thank you, I'm thinking of buying a 731 cam of someone on here for my 998 and he says theres wear and I've asked if he can measure them to see how worn they are

[minimadles]

Work shop manual states 1.6655 to 1.666 front
1.62275 to 1.62325 middle
1.3725 to 1.3735 rear

[Chappb]

Work shop manual states 1.6655 to 1.666 front
1.62275 to 1.62325 middle
1.3725 to 1.3735 rear

Use these figures then you can't go wrong! haha...

[Gremlin]

Thank you very much!