Still sorting and got the starter bolts figured out. They are stamped with "TR7" and right at 35mm just as DD indicated. They are flush with the end of the transmission housing. Can't tell from the pic. Will post the bolt head size tomorrow.

For sure staying with OEM Nissan bolts. I replaced a set of heads on a GMC truck not too long ago and decided to try ARP bolts for the exhaust manifolds. Heard alot of good things about that brand. Several of the bolts started to cross thread into the cylinder heads and had to keep backing them out to get them started and the bolt heads were not as big as the GM bolts. Got rid of them and bought Genuine GM bolts. The Nissan flywheel bolts are quite impressive.

I posted the pressure plate bolts. Do they look like correct ones? A total of 6 and right at 18mm.

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Those look like the clutch cover bolts

B110 used separate washers
30223-E4100 SCREW-CAP CLUTCH COVER TO FLY WHEEL (6)
08915-23810 WASHER-SPRING (6) [M8]

Starting in 1980 JAN they switched to bolt with washer
01121-00402 8001-8504
01121-00772 8504-

and now they are back to the original w/o washer type

$8 each at Nissan

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Those starter bolts are just as I remember: built-in washer & lock washer, fits flush to the back of the threads, head size 15mm (or was it 14mm)

The bolt manufacturer's mark 'TR' may be Trifast, they are worldwide and OEM to Japanese companies ... but maybe not as they only started in 1973

'7' means 7T high carbon steel (JIS Standard) . It's on a lot of Nissan bolts and '4' on the lesser bolts

Clutch cover bolts...aka pressure plate bolts??

Starter bolts are 14mm.

Got my gusset bolts figured out. There is a "9" or "b" stamped on the end. I have 2 types of gussets. The heavier one is for my 56L gearbox?

Am I missing anything in the pic with the starter and gusset installed? With the exception of the smaller bolt which I found.

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Yes, clutch pressure plate. Nissan calls it "clutch cover"

Those bolts are '9' in the strange typeface to make it unique from '6'
JIS 4T is "low carbon steel" (no mark means 4T)
JIS 7T is "high carbon steel" (8.8 standard is stronger)
JIS 9T is "alloy steel" (10.8 is stronger)

It seems the gusset-to-block bolts are high strength because they are so small (M8). The alloy steel allows a higher torque

The cast bracket I believe is the early type, then in 1980 or so changed to the stamped type. 30mm long bolts for the stamped gusset, 40mm for the cast type

The 56L (early B110 gearbox) did not use a gusset, which was first used with the B210

Quote:Looks good to me. I think both bottom bolts are the same?

The extra bolt hole in the gusset may be for the B310 exhaust pipe bracke

Thanks DD. Wrapping up identifying all of the bolts. Here are the gusset-to-block bolts with a philips head. Think I got them right. They fit nicely. And the bottom housing bolt is shorter in length (20mm) since it only secures the adapter plate to the transmission and has a "4" marking.

Now on to a problem I have is that the transmission (FS5W60A) is not sitting down inside of the A-15 crankshaft. There is a plug on the end of the crankshaft preventing it from setting in there. Any idea what is going on?

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  crankshaft1.JPG (151.38 KB)

The gusset-to-block bolts are the '9' bolts (high strength)

Maybe somebody drove in a plug in effort to remove the pilot bushing. Remove the plug?

Do you have a picture of what the end of an A15 crankshaft looks like?