Replacing Leaking Cam-Hub Outer O-Rings (Seals)

Part One - Main Article
Part Two - Notes
Tools (Cam Pullers)
Cam Hub Diagram & Dimensions

A= Distance between the three bolt holes = 50 mm or 1.97", the diameter of these holes is 8 mm approx (sufficient to freely pass the 7mm bolts which screw into the cam sprocket behind)

B= Distance between the bolt holes and the central hole = 29 mm or 1.14". This is also the distance from the centre to the two clearance holes (two more 7 mm bolts reside in there fixing the middle cam plate and the cam sprocket together)

Total diameter of cam hub = 77 mm or 3" approx

Diameter of the central bolt hole = 20 mm or 0.79" approx (NOTE: this is where the puller requires a threaded hole for the puller bolt, eg 5/8")

All measurements are hole-centre to hole-centre, and taken from a 1989 12V-V6.