Both the Blocks & the heads can be Metric or English! Yes it's true.
Leave well enough alone and use the stock threads on every hole you find.
Bolt clearances will be fine. It will just be frustrating when you do any
rework on the motor.
I have an English block & head, but it has a metric water pump, Oil Pump,
Alternator & Distributor.
Good luck,
Walter Peterson
Goleta Ca, 93117
Street driven race motor
2000 3-Main(R) Solexes, cam etc.
5-Speed & LSD.
-----Original Message-----
From: datsun-roadsters-bounces@autox.team.net
[mailto:datsun-roadsters-bounces@autox.team.net] On Behalf Of Eddie
Sent: Monday, March 02, 2009 10:37 PM
To: Datsun Roadster List
Subject: [Roadsters] Newest problem SAE / Metric
So, Here's the latest problem I've discovered.
Not sure if it was the PO or the mechanic who put my motor back
together, but my block, which is an H20 (serial number 776777), appears
to be metric. (My head is SAE)
Turns out, some bonehead used SAE bolts in many of the spots on the
block. I'm wondering if I should pull the motor mounts, and
transmission to engine bolts too, to re-tap them back to metric, but
they seem pretty tight. Plus, I'd have to pull the motor again, not
something I'm looking forward to doing AGAIN....
Thoughts?
Tonight, I disassembled all of the exterior parts, water pump,
alternator bracket, fuel pump, etc, and tapped them clean again back to
metric. They were NOT chewed up too bad, so I think I'm ok. I'm going
to order new bolts from McMaster.
I found it weird that the water pump seems to use 3 different sized
bolts. a 8mm 1.25 and a 9mm 1.25 and a 10mm 1.25. Does that sound
right to you guys?
Also, it appears the timing chain cover bolts used were SAE, and my
guess is they SHOULD have been metric, yes?
Eddie
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