problem or paranoia

blackbetty · Post by **blackbetty** » Thu Feb 25, 2010 9:12 pm

yesterday drove to work and car started making doogdoogdoogdoog noise posibly from the head. but stopped car at gas station put gas in. 95octane as i advancd the timing couple days earlier and thought it mite be contributing.but it had done it before the advance.hasnt done it since? problem or jst a quirk?

WideOpenThrottle · Post by **WideOpenThrottle** » Thu Feb 25, 2010 9:17 pm

Your head or the cars?

lol.

blackbetty · Post by **blackbetty** » Thu Feb 25, 2010 9:18 pm

haha maybe either but i meant the cars

blackbetty · Post by **blackbetty** » Fri Feb 26, 2010 9:12 pm

i turned on my air con for the first time in 6months the noise becomes much much greater.then i noticed the main pully seemed to have an odd movement to it looked almost side to side.is it the belt maybe fooling my eyes.a busted bearing or something in the a/c pump? gunna pull off the belt tomorrow and and see if the noise disappears completely. excuse to pull of the pump and shed some kilos. but opinions in the mean time would be greatly appreciated.

sprsta · Post by **sprsta** » Fri Feb 26, 2010 9:26 pm

doesnt take much to remove an ac system
i kept my ps i dont think the pump robs enough power to remove

blackbetty · Post by **blackbetty** » Sun Feb 28, 2010 11:47 am

turns out the keyway that holds in the plate the main pulley bolts to was broken.thats what the rattle was. so my car is at work front and rocker cover all off. where am i gonna find a part like that? how the hell does that break?

Ben.Nakagawa · Post by **Ben.Nakagawa** » Sun Feb 28, 2010 12:46 pm

Sorry to hear that, What year is yours?

I have an early short nose version and I'm aware that is a weaker point in an engine design. if I do not maintain that properly, it's eventually going to deform the key way and broken like yours, wobbly pulley is some typical symptom. (I've hard many smiler incidence with later stronger design so it not always happen to SNC).

Speaking of that, when the timing belt is changed or some reason the bolt has been removed, always use new key and bolt and lock tight.
(just search Short nose, SNC or smiler in Miata.net forum.)

I hope it's not too bad and still fixable, I would contact Mazline or dealer for the new parts. If the key way is badly deform, you may want swap the engine or fabricate new key to match.

I'm really sorry for that and I hope I'm wrong here and someone correct me.

blackbetty · Post by **blackbetty** » Sun Feb 28, 2010 9:29 pm

thanks for the info makes me feel better that it wasnt me somehow.mines a 92 na6ce. ill be calling mazline tomorrow then. it was still running fine so i rekon itll be ok. but yea key way didnt deform it was actually snapped dont know how im gonna get the other peice outa the gear it locks into.

Ben.Nakagawa · Post by **Ben.Nakagawa** » Mon Mar 01, 2010 4:37 pm

If you take a pic of it and send it to Mazline they will be get more clear understanding. They are very helpful bunch. Good luck.

Growler · Post by **Growler** » Mon Mar 01, 2010 5:28 pm

The 92 should have the bigger crank nose to begin with.

blackbetty · Post by **blackbetty** » Mon Mar 01, 2010 8:45 pm

managed to get the gear off today. had to drill and tap two threads in it and use a puller on it. bloody hard but atleast its out...so next step is order all the parts tomorrow. will update when its all back together and running. while its off the ground ill be installing the new king lowering springs. hope they are stiff enough.

Ben.Nakagawa · Post by **Ben.Nakagawa** » Mon Mar 01, 2010 10:56 pm

Growler wrote:The 92 should have the bigger crank nose to begin with.

As I state what I've hard/seen in other forums are this is not only a SNC problem but with other later design as well. It's all comes to how it was maintained.

Make sure torqued properly.
http://www.miata.net/garage/torque.html

SLYDIT · Post by **SLYDIT** » Thu Mar 04, 2010 11:16 am

so what actually broke? The crank nose or the bolt or the piece of key steel?

blackbetty · Post by **blackbetty** » Sat Mar 06, 2010 4:31 pm

the key way.there was a small chip in the slot it slides into so i got liquid metal filled and filed it. til i buy a second engine to rebuild and modify. but yea its all fixed now and runs mint.

Ben.Nakagawa · Post by **Ben.Nakagawa** » Sat Mar 06, 2010 7:36 pm

I've hard it is fixable if that was not too bad, but I didn't know how it was actually done. Thanks for sharing.

blackbetty · Post by **blackbetty** » Sun Mar 07, 2010 9:54 am

the metal filler is a wurth product. about 100 bucks a box. but itll last forever as long as your friends dont knick it. never get the similar product from repco its ass.

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