knocking, just rebuilt...
i am brand new to the internals of the motor so please help see where i went wrong or what i need to do. I rebuilt the motor just droped it in. when i start it up the exhaust note sounds good but it sounds like the motor is knocking like crazy although there is very little vibration to the entire motor. Is this a timing problem or did i rebuild it wrong?
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Start off with the easy stuff:
1. What mods are on your car? 2. If you are using the stock ECU, did you check to see if you have any stored codes? 3. Have you done a compression test to check the new rebuild? |
i have a pfc tuned by chris sanders last year when i got my reman... mods are basicaly 3in exhaust and peter farrell ic. I do not have the comander with pfc and doing the compression today.. it sounds like its comming from rear housing
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compression is 110+ on front rotor and 86-89 on rear which is not good....
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nevermind its about 80 in the rear..*sigh*..
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knocking is the result of a bearing failure/spun, allowing freeplay between the rotor and shaft, letting the tips of the rotor contact the housings and irons. Go on ahead and tear it back down.
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not necessarily, it could also be loose flywheel bolts if you have a lightweight flywheel.
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why do you automatically think it's knocking? Could it just be misfiring? or do you actually hear a loud tap sound from the engine?
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yeah they're taps clack, clack, clack......consistant....O well at least i tried it..ill just send it in to get it rebuilt
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if it did spin a bearing you may be better off just getting a good used motor, lubrication issues in these engines result in a very costly rebuild.
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he probably means send it in to mazda for a core... well if hes smart i mean lol
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Originally Posted by mono4lamar
he probably means send it in to mazda for a core... well if hes smart i mean lol
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He means your motor is probably FUBARd, and a rebuild will mean a lot of new (or used) parts that you'll have to get from somewhere. If it is a bad bearing, your e-shaft is definitely f*cked. Ask me how I know :( The point is to use your shitty core and get reman from Ray Crowe @ Malloy Mazda 1-888-534-3400. Going price is $2600 + core ($1000) right now I believe. Probably cheaper than putting yours back together. Only caveat is that you can't take the engine apart to use as a core. Good luck.
EDIT: BTW, damn, 110 psi compression on the front rotor? That's pretty good from what I understand... so sorry to hear of your loss on the rear... |
but it is a reman from a year ago with maybe 3k after the initial 2500 mile break in...thats y i tried to rebuild it myself
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So i was tearing it back down and i found that the slave cylinder head was in the bell housing!!! ive read in many places that it takes some time to gain full compression???
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Originally Posted by mdpalmer
He means your motor is probably FUBARd, and a rebuild will mean a lot of new (or used) parts that you'll have to get from somewhere. If it is a bad bearing, your e-shaft is definitely f*cked. Ask me how I know :( The point is to use your shitty core and get reman from Ray Crowe @ Malloy Mazda 1-888-534-3400. Going price is $2600 + core ($1000) right now I believe. Probably cheaper than putting yours back together. Only caveat is that you can't take the engine apart to use as a core. Good luck.
EDIT: BTW, damn, 110 psi compression on the front rotor? That's pretty good from what I understand... so sorry to hear of your loss on the rear... |
Originally Posted by orangeglowFD
ive read in many places that it takes some time to gain full compression???
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i have the front rotor pointing down and the rear rotor pointing to the side...i believe this is correct but thats the only part i see that i could have done wrong
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The compression on the rear will not raise to meet the front. Even on a fresh rebuild they should be close to the same from front to rear, then during the break in they will both raise evenly.
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