Can anyone tell me which of these bolts are for the rear main seal cover, first-time engine rebuilder and I didn't organize my hardware very well. Also if anyone knows of a book like the Workshop Manual that also details hardware sizes so I know for issues like this in the future.

Thanks,
suvend

 

Here you go:


There are two 20mm long M6 bolts on the "bottom"/sides, and two 16mm long M6 bolts on the top.

99796- Base code for a flanged, zinc coated JIS bolt
06- M6 thread
20- length in mm

I'm not sure how to tell whether or not the bolt has a relief on the tip of the threads from the part numbers, but I'll get there eventually.

https://www.miata.net/garage/90-99Parts/index.html

 

Middle two look right to me, you’d need x2 of each obviously.

 

Gotcha, thanks so much for the link as well!

 

Thanks! Assuming from the link the other reply sent I'd use the shorter 16mm bolt in the holes closest together.

 

Measure the depth of the holes.

 

if the two “bottom” 20mm bolts are feel like they are not threading and get tight before they are seated is that because the threads in my block are bad? all 4 of these should be the same m6 threads correct?

 

Same m6 threads, yes. But two different lengths. Throw that bolt away and try again.

 

Based on this bolt picture from Tasca Parts, the 99796-0620 should be a full thread bolt.
https://www.tascaparts.com/oem-parts...head-997960620
I ran a tap though all of the bolt holes on my block before reassembly, and it really gave a lot of confidence in my torque measurements. I pulled a lot of crud out of some of the holes.
You should really do it with a thread chaser tool, but we didn't have on at work that I could borrow for the weekend.

 

That seal puller has made my life so much easier. Thanks for the rec.