1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

12a front cover interchangeability

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Old 10-07-09, 03:35 AM
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12a front cover interchangeability

Hi All-
Q: have access to 84-85 12a front cover - will it match up to 80 12a block?
both use a FMOC....
Any diffs to be worried about? Like engine mount bracket, etc.
Thanks!

Stu Aull
80GS
Alaska
Old 10-07-09, 04:41 AM
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will match.
Old 10-07-09, 10:18 AM
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only difference is that the 84-85 cover has the castings for the turbo oil drain.
Old 10-08-09, 03:22 AM
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Originally Posted by j9fd3s
only difference is that the 84-85 cover has the castings for the turbo oil drain.
Turbo? seriously? As in : JDM turbo? what is it - a plug? do I need to do anything about it or....?

Thanks all
Stu Aull
80GS
Alaska
Old 10-08-09, 07:45 AM
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Originally Posted by j9fd3s
only difference is that the 84-85 cover has the castings for the turbo oil drain.
good to know.


Originally Posted by 7aull
Turbo? seriously? As in : JDM turbo? what is it - a plug? do I need to do anything about it or....?

Thanks all
Stu Aull
80GS
Alaska
nope, u wont need to do anything. the area just wont be drilled/tapped for the return. but now knowing this cover has this provision, i'll be using one if i ever go turbo.
Old 10-08-09, 09:15 AM
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Originally Posted by j9fd3s
only difference is that the 84-85 cover has the castings for the turbo oil drain.
thats great to know!! i learned something today!! thats why i love coming here so much, i always learn something!!!
Old 10-08-09, 11:18 AM
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Originally Posted by 7aull
Turbo? seriously? As in : JDM turbo? what is it - a plug? do I need to do anything about it or....?

Thanks all
Stu Aull
80GS
Alaska
nope its not drilled out, just there.
Old 10-08-09, 11:49 AM
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Interesting. I never noticed that. First picture is GSLSE cover on the left and what I believe is an 84 12A cover on the right. Second picture is an early 12A cover or maybe an RX-4.
Attached Thumbnails 12a front cover interchangeability-fc1.jpg   12a front cover interchangeability-fc2.jpg  
Old 10-09-09, 02:59 AM
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Thanks guys!

Stu Aull
80GS
Alaska
Old 10-09-09, 07:48 AM
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There's a small splash guard on the TurboII blocks mounted directly behind that hole. It's super simple to mount, I think it uses two 10mm nuts that hold the oil pump in place. Without it you'd be splashing hot turbo return oil all over you oil pump. Mazda did put it there for a reason.
Old 10-09-09, 11:01 AM
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Originally Posted by 85TIIDEVIL
There's a small splash guard on the TurboII blocks mounted directly behind that hole. It's super simple to mount, I think it uses two 10mm nuts that hold the oil pump in place. Without it you'd be splashing hot turbo return oil all over you oil pump. Mazda did put it there for a reason.
they only did that on the s4's, which makes it kinda odd
Old 10-09-09, 11:33 AM
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huh'... I guess they took it away for a reason tooo then... haha
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