2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

how to identify engine?

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Old Apr 16, 2006 | 07:32 PM
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how to identify engine?

just bought a 6-port engine and i wanna know what year it is? how can i find out

it had power stearing,emission controll(air pump) and was automatic

i need help so i can buy the correct parts thanx
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Old Apr 16, 2006 | 09:44 PM
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if it is from a gsl-se it would have motor munts on the front cover and none on the oil pan. If it is s4 it has motor mounts on the bottom of the engine. S4 rear iron inspection cover has 2 bolt holes one on each side, s5 only has 1 bolt hole on the inspection cover. thats the external differences.

The spark plug holes are different from s5 to s5 as well
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Old Apr 16, 2006 | 09:47 PM
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Coolant neck on top of the waterpump housing can also tell you between s4/s5. S4's have a filler cap on the neck, as where s5's do not.
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Old Apr 17, 2006 | 07:53 AM
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Take the engine serial number to a Mazda parts person and they can tell you the vintage.
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Old Apr 17, 2006 | 08:07 AM
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If it has an egr in the middle plate, then it is 88 and older. 89 and newer sixport engines didn't have egrs in the intermediate housing.
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Old Dec 28, 2006 | 12:09 PM
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I've read all the threads and am still confused .Isent a picture to atkins rotary and they said it was a 89 -92 turbo. The intake gasket looks like a 86-88 model. The thermostat housing has a filler cap on it and I haven't found an egr valve. the rear iron inspection plate only has one bolt hole in it.
Attached Thumbnails how to identify engine?-buggy-019.jpg   how to identify engine?-buggy-021.jpg   how to identify engine?-buggy-018.jpg   how to identify engine?-buggy-017.jpg   how to identify engine?-buggy-022.jpg  

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Old Dec 28, 2006 | 12:27 PM
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looks like a s4
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Old Dec 28, 2006 | 01:07 PM
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well it has s5 housing. the s4s didn't have a knock sensor hole.
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Old Dec 28, 2006 | 01:11 PM
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Originally Posted by Rocking Rotary
well it has s5 housing. the s4s didn't have a knock sensor hole.
uh..the knock sensor is on the iron, not the housing, and s4's did have knock sensors. the TPS and coolant neck are s4's
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Old Dec 28, 2006 | 01:12 PM
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The pics included above are for a S4 Turbo.
It has a narrow range TPS. S5's use a dual widerange TPS.
It also has the S4 twinscroll turbo.

Oh yeah and like said above. The knock sensor is on the front side of the oil fill tube(you can barely see it in your pic on the top middle)

Oh and a nother dead give away is the mechanical oil metering pump on the passenger side of the front cover.
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Old Dec 28, 2006 | 01:15 PM
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Originally Posted by Digi7ech
The pics included above are for a S4 Turbo.
It has a narrow range TPS. S5's use a dual widerange TPS.
It also has the S4 twinscroll turbo.

Oh yeah and like said above. The knock sensor on S5's is above the spark plugs while S4's have it on the front side of the oil fill tube(you can barely see it in your pic on the top middle)

Oh and a nother dead give away is the mechanical oil metering pump on the passenger side of the front cover.
Digitec beat me to it.. But the TPS was a good giveaway
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Old Dec 28, 2006 | 02:09 PM
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uh, how about the metal filler neck? that'll tell you too. I dont know about the inspection panel tho... on both the 88 NA and 88 turbo engines I have, the inspection panel has one bolt. I dont have the full history of either engine, so concievably stuff could have been switched on both, but it doesnt seem to be that way.
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Old Dec 28, 2006 | 03:40 PM
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Thanks I was going to order new gaskets and a rear counterweight for it and didn't want to order the wrong ones .
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Old May 3, 2012 | 09:58 AM
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do u guys think a gasket kit from a 90 N/A will work with a 87 N/A? at least some of the gaskets?
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Old May 3, 2012 | 12:27 PM
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Are you the holy thread ressurector??
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Old May 3, 2012 | 04:00 PM
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…Yes it will work, you will have to enlarge the LIM-UIM gasket holes for the studs.

It really wasn't necessary to bring up a 6yr old thread that's completely unrelated..
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Old May 3, 2012 | 04:08 PM
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i usually use my eyes to tell the difference between engines, they usually taste, feel and smell the same....
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Old May 3, 2012 | 04:31 PM
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Old May 5, 2012 | 12:05 AM
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oh my bad i wasnt aware how old this thread was. but thanks
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