Which way does the lifter chamfer edge face?

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dynodave said:
1. The lifters are mounted in the engine at 12 deg rearward tilting. That makes the oil puddle up on top of the lifer to flood lube the lifter bores until it finally over flows down the FRONT chamfer of the engine towards the cam.

2. The oil flowing down the FRONT of the lifter bore toward the cam. Naturally if the cam rotates the opposite direction of the crank...the oil will be coming onto the cam and lifters on the leading edge of the action. The cam sweeps from front to rear.

3. Would this not be the preferred location to oil the cam and NOT on the back side of the cams natural sweeping action.

4. Who would purposely put the drain chamfers toward the rear???? engine angle makes no difference to cam lube style

5. Who would not correct an obvious chamfer mismatch ???
Click to expand...

Dave,

Like I said I have always put them in chamfers together forward. The only Norton assembly manuals I have ever read are Commando ones so I don't know what an Atlas or Dominator manual might say. I was responding to the forward tilt comment, and I simply meant what I said, I was not sure it made a difference with the vertical mount.

Your explanation is clear and I will happily carry on doing as I have always done, but now in the knowledge that to do different would make a difference.
 
Interesting what you learn - I did not know about these chamfers and intended position before this thread.

Also, to make things worse, on my 650 I have 3 x LH tappets and only 1 x RH tappet so can't get the correct configuration with my current set.
They've recently been reground and stellite pads appear well connected and in good shape.
Should I buy another pair (they only seem to come in pairs) or can I (read here "has anyone else done this") repair my orphan - put chamfer in correct location and braze and dress the errant chamfer?
I would only repair the upper part of the chamfer (enough to block oil path) with cooling on the stellite pad.
If so they will still run in original tunnels - the RH cylinder outside tappet is the "odd bastard" - all but that one had the chamfers facing forward when I pulled them out
Any constructive advice welcome.

Cheers
Rob
 
Just a thought - I wonder how many of the catastrophic cam failures we have seen on this forum were due to inadequate lubrication caused by incorrectly installed tappets?
 
robs ss said:
Interesting what you learn - I did not know about these chamfers and intended position before this thread.

Also, to make things worse, on my 650 I have 3 x LH tappets and only 1 x RH tappet so can't get the correct configuration with my current set.
They've recently been reground and stellite pads appear well connected and in good shape.
Should I buy another pair (they only seem to come in pairs) or can I (read here "has anyone else done this") repair my orphan - put chamfer in correct location and braze and dress the errant chamfer?
I would only repair the upper part of the chamfer (enough to block oil path) with cooling on the stellite pad.
If so they will still run in original tunnels - the RH cylinder outside tappet is the "odd bastard" - all but that one had the chamfers facing forward when I pulled them out
Any constructive advice welcome.

Cheers
Rob
Click to expand...

I've got extra tappets if you need them, pm me.

robs ss said:
Just a thought - I wonder how many of the catastrophic cam failures we have seen on this forum were due to inadequate lubrication caused by incorrectly installed tappets?
Click to expand...

Jim C has done testing on this issue and I believe the evidence points to a QC issue in manufacturing more than anything else
 
acadian said:
I've got extra tappets if you need them, pm me.
Click to expand...

Thanks very much for the offer but I think I'll stick with these for now.
I have decided against building up the errant chamfer (risk of heat damage) but will grind a chamfer in the correct place.
It, together with the correct chamfer on its mate, will give a larger path for oil to flow down the front of the tappets - probably give the desired effect.

Cheers
Rob
 
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