front cover componants 13b rew
can anyone post a picture or list a link showing the order in which the componants under the front cover are installed much appreciated
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Originally Posted by savana
can anyone post a picture or list a link showing the order in which the componants under the front cover are installed much appreciated
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Grab a Factory Service Manual (FSM):
http://www.iluvmyrx7.com/3rd_gen_manuals.htm It will be basically the same for any of the years in that area. |
3 Attachment(s)
0117 - washer...make sure bevel is in the correct direction.
0118 - needle bearing and spacer 0119 - thrust plate |
4 Attachment(s)
0120 - 2nd needle bearing
0121 - counter weight and key 0122 - oil chain sprocket 0124 - OMP gear and pulley boss. (stack up) |
BTW, I'm pretty sure there's a VERY thin washer on the back of the counterweight. It usually stays stuck to the counterweight so you never really notice it :).
I believe Dubulup has it spot-on, though. BTW, that's a good thing to have documented the stuff under the front cover - I remember confusion with that the first time I rebuilt a motor, and the shop manual is a bit tricky to tell orientation and stuff. Dale |
hey, just a quick question about the counterweight......i know it is used to balance the whole rotating assembly but what exactly is it counteracting? I would think since there are two rotors that they would balance out, but they may not be completely out of phase with eachother. thanks.
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Originally Posted by DaleClark
BTW, I'm pretty sure there's a VERY thin washer on the back of the counterweight. It usually stays stuck to the counterweight so you never really notice it :).
I believe Dubulup has it spot-on, though. BTW, that's a good thing to have documented the stuff under the front cover - I remember confusion with that the first time I rebuilt a motor, and the shop manual is a bit tricky to tell orientation and stuff. Dale Yeah, thought about mentioning it...but since they usually say on (I've tried to get it off and couldn't, haha), I didn't want anyone going out and looking for it, thinking they lost it.
Originally Posted by saxman47
hey, just a quick question about the counterweight......i know it is used to balance the whole rotating assembly but what exactly is it counteracting? I would think since there are two rotors that they would balance out, but they may not be completely out of phase with eachother. thanks.
I used a light weight fly, and had the rotors and front and rear weights balanced together. |
Originally Posted by dubulup
The rear counter weight...built into the stock flywheel.
I used a light weight fly, and had the rotors and front and rear weights balanced together. When you use a light weight flywheel, you generally use the counterweight off of an auto car. Since this weight was designed for the BREW, you don't have to have the entire assembly balanced (although, it definately can't hurt. Especially if you're planning on revving extremely high, or producing crazy HP numbers). -Rob |
^ Thanks for that, makes sense...I never really understood, how you could just slap an auto CW on a manual with a light weight fly.
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thanks dupulup have only built fc motors and just bought this motor in bits and wasnt sure about the minor differences
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make sure that you don't rotate the engine BEFORE installing all of the components back together or you will have BIG problems down the road.
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Originally Posted by dubulup
0120 - 2nd needle bearing
0121 - counter weight and key 0122 - oil chain sprocket 0124 - OMP gear and pulley boss. (stack up) |
Originally Posted by saxyman990
Not exactly... in general: (very simplified) the front counterweight offsets the inertia of the rear rotor. The rear counterweight offsets the front rotor.
On a related topic, anyone know if the thrust washers and cover plate on the previous series interchange with the FD? |
Originally Posted by CMonakar
These pics are very helpful. Thanks.
Originally Posted by billyboy
A question, what is the difference between the front counterweights on automatic and manual cars - just drillings? Using the above reasoning, can't see why Mazda would need to produce two separate parts unless it was related to the flywheel/flexplate differences.
On a related topic, anyone know if the thrust washers and cover plate on the previous series interchange with the FD? |
Front counterweights
N3A7-11-D61 (MT) N3A8-11-D61 (AT) Always in the past when putting on an aftermarket flywheel, just used a rear counterweight from the autos with no regard to the front counterweight and haven't noticed any ill effects - but maybe I was wrong. The engine I've got has suffered an oil pump failure and the needlle bearings have disintegrated and damaged the front counterweight. The engine I'm getting parts from is a JDM auto import but will be used with a standard manual flywheel. Given the propensity of these things to shit themselves would prefer to leave nothing to chance. |
Just for future reference, the front auto counterweight is 1.4mm thicker than a manual one, must have something to do with the radial position of the counterweight on the standard FD flywheel.
Crap photo, might give you an idea. http://img174.imageshack.us/img174/1...0134eh0.th.jpg Detail difference, auto- http://img247.imageshack.us/img247/7...0130gb3.th.jpg manual http://img503.imageshack.us/img503/9...0131aj7.th.jpg |
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