The bolts that were used were clearly SAE. The holes are clearly
metric. The bolts screw in, but don't tighten properly, and they feel a
little loose until "snugged".
There were no "stock bolts" on the thing.
I'm leaving the timing cover bolts alone, but the others I've already
run a tap through. It went in easily, and only a little crud came out.
Seems the block was harder than the bolts that were used, and the bolts
took much of the wear.
I'll use lock-tite on all the bolts, and I figure that should be fine.
The only other option, which I would have considered prior to putting
the engine back in, is to helicoil the holes, but now that would be a
Walter Peterson wrote:
> 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: firstname.lastname@example.org
> [mailto:email@example.com] 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....
> 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?
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