rexbd (5/8/2009)
Which way is the angle on the hole for thrust plate modification. If drilling at 45 degrees I assume this is done to angle towards the flow of the oil to allow for better passage into the groove. Towards 12 Oclock, or 6 Oclock etc?...I drilled my hole straight in. You are going into an oil hole with ~40-psi of pressure. The concern is, not to make the hole too large because the #1 cam bearing needs oil flow. There will be plenty of oil (regardless of angle) to lube the timing chain.
I like the idea of cutting passages into the bearing as that ensures the bearing gets oil first. Either method is good as long as it's done right.
I put a rod inside the oil hole from the crank journal, and picked my drill-hole location by eye (it's easy). Then I drilled the sixty thousandths hole straight in at 90*. I spread a very thin layer of plumber's putty (or clay) on the thrust plate, I bolted the uncut plate in, to squish the putty. When I unbolted the plate, the block hole showed up as a dot on the back side of the plate. I center-punched the dot, and drilled a shallow dimple in the punch mark (for location variation). Then I grooved the plate from the dimple to the plate's edge with a thin Dremmel disk.
The thrust plate (not the block) gets the small groove. That way, if you ever need, you can block the hole by simply turning the plate.
Whew! All that for a tiny (but important) hole. The chain only needs a few drops of oil per minute. A .060" hole will give much more than that, in fact, a smaller hole will do just fine.
- Dave
Royal Oak, Michigan (Four miles north of Detroit, and 12 miles NORTH of Windsor, Canada). That's right, we're north of Canada.Ford 292 Y-Block major overhaul by simplyconnected