Quick question for the Mazda BP experts...: Off-topic discussion forum: Grassroots Motorsports Magazine

March 10, 2010 12:36 p.m. turboswede UltraDork

Helping a co-worker change the headgasket on his 92 Protege DX (1.8L 16-valve SOHC) and we can't seem to find headbolts for it.

I've found tons of info on how to swap in a DOHC motor, but he just needs his commuter back as he's got a street bike and three rambunctious young boys to get his excitement.

So, since I'm new to the whole B-series Mazda motor thing, I'm wondering if the DOHC bolts are the same as the SOHC bolts?

Do you really need to replace the bolts or can they be used twice?

TIA
March 10, 2010 12:37 p.m. Keith PowerDork

The DOHC ones can be used multiple times. Never worked on a SOHC, but I'd be amazed if they were different.
March 10, 2010 1:20 p.m. turboswede UltraDork

Thanks, that helps. Since he has to take the head in to be checked, I'll have him look at prices and availability at NAPA.

Thanks!
March 10, 2010 4:13 p.m. Lesley SuperDork

I just re-used the ones in my 323. Don't they have to be "stretch bolts" to be replaced? Whatever that means?
March 10, 2010 5:25 p.m. 93celicaGT2 UltraDork

Lesley wrote:

I just re-used the ones in my 323. Don't they have to be "stretch bolts" to be replaced? Whatever that means?

Yeah, Torque-to-Yield bolts.