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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 01-13-2008, 09:37 AM   #1
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the viggens crank..pics

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i was wondering how you change the main bearings on the crank?without replacing the whole crank?and the people at the tune shop told me for a 4 cylender i dont need it to be balenced..just bake the block replace the main bearings rods and pistons on the lower end......sugestions on building it?

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Old 01-13-2008, 09:45 AM   #2
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i know this wire went up near the throttle body ..u can flame me...but what exacly is it and what did it do ....is it fixable?
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Old 01-13-2008, 10:17 AM   #3
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That is the CKP or crank postion sensor. IF the the harness is cut i would reccomend replacing it. Those tend to fail anyway so it would be a good ides to just do it.
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Old 01-13-2008, 10:18 AM   #4
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kinda hard to tell about the journals on the crank from those pictures, however it does appear that the tonewheel is all bent to shit.....

that engine doesn't look very clean inside either...

that wire with the blue connector, is that the one you're asking about? that's the crankshaft position sensor. replace it.
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Old 01-13-2008, 10:42 AM   #5
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Quote:
Originally Posted by itsaviggn View Post
[IMG][/IMG]


i was wondering how you change the main bearings on the crank?without replacing the whole crank?and the people at the tune shop told me for a 4 cylender i dont need it to be balenced..just bake the block replace the main bearings rods and pistons on the lower end......sugestions on building it?

Many people balance their 4 cylinder engines, it may not be as crucial as a v-8 engine, but it still helps! I had my crank balanced and it took a good chunk of metal to balance it...

You have to pull the crank out of the block to get all the main bearings out and you cannot get that last one on the clutch side without removing the tranny and end plate so that you can remove the crank, replace all the main bearings and then put in you're new crush sleave.

You can do the rod bearings without removing the crank or the tranny, just the oil pan.

Good Luck,

John
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