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-   -   Head alignment pin missing (https://www.miataturbo.net/engine-performance-56/head-alignment-pin-missing-101744/)

dsamani 12-16-2019 10:07 PM

Head alignment pin missing
 
My engine is missing this part:

https://www.ebay.com/itm/Genuine-199...QAAOSwwmJZDNBb

It's the head alignment pin that goes onto one of the bolt holes to align the head respective of the block, PN B630-10-306.

My engine is missing this.

I'm running ARP head studs, which seems to do a somewhat decent job of lining things up, but the engine won't be PERFECTLY aligned. Can I get away with it, or should I buy the part? It's not so much a matter of cost, but more time.

hks_kansei 12-16-2019 10:18 PM

Up to you.

How much is your time worth?

Wait a few days and spend $6
or save a few days and potentially have to re-do the job?


I'd just get a new dowel/locator.

Contact a local engine/head rebuilder and see what they have, they might have some in stock they'll sell you.

dsamani 12-16-2019 10:28 PM


Originally Posted by hks_kansei (Post 1557373)
Up to you.

How much is your time worth?

Wait a few days and spend $6
or save a few days and potentially have to re-do the job?


I'd just get a new dowel/locator.

Contact a local engine/head rebuilder and see what they have, they might have some in stock they'll sell you.

Wait a few days and spend $6 it is.

Joe Perez 12-16-2019 11:32 PM


Originally Posted by dsamani (Post 1557374)
Wait a few days and spend $6 it is.

https://external-content.duckduckgo....jpg&f=1&nofb=1

curly 12-16-2019 11:50 PM

Never done it myself, but I remember someone saying they’ll slide around fairly easily under boost without them. Misaligns coolant and oil passages with all sorts of related complications.

compaddict 12-17-2019 10:50 AM

YMMV but I forgot to install it once on my 99 engine and blew coolant after 15 minutes.
Vince

Stealth97 12-17-2019 11:55 AM

Yes, you need it if you want the head gasket to stay put. I almost made the same mistake.

m2cupcar 12-17-2019 12:27 PM

Another vote for the pin to avoid head gasket walk. I know.

dsamani 12-17-2019 02:39 PM


Originally Posted by m2cupcar (Post 1557425)
Another vote for the pin to avoid head gasket walk. I know.

Wow I had no idea this was a thing. I figured once the head was torqued down, that sucker ain't movin!

compaddict 12-17-2019 09:45 PM


Originally Posted by dsamani (Post 1557439)
Wow I had no idea this was a thing. I figured once the head was torqued down, that sucker ain't movin!

Me too! Now I know.


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