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Old 02-22-2009, 01:58 PM
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SBC400 serpentine problem!! help W/Pics!!

Ok my build has been going fairly smooth and straight forward with minimal problems until mounting up my GM serpentine system. It seems that one of my heads did not have the mounting holes for one of the bolts to hold it to the block so I took care of that issue. During this build process I purchased a stock 400 balancer from summit, I think it was a pioneer balancer. The problem I am having is that I cannot get the balancer to seat back far enough on the crank snout. As far as I can tell the balancer is fully seated on the crank snout but to me it still looks about a 1/4 of an inch out to far? I disassembled the two and put a small dab of RTV on the end of the crankshaft snout and bolted the balancer back up. then disassembled again to find that the RTV was completely mushed flat, so the balancer has to be down all the way on the snout? Is it possible that the balancer is to long?

The biggest problem with this whole thing is that because the balancer will not go back any further my serp belt is off by about 1/4 inch. I can use some washers behind the serp mounting brackets to pull them forward to mount up properly but I didn't really want to do this if I just have a balancer problem.

One more issue is that if it is not back further will this allow oil to leak between the snout and the timing cover?



!!!!!!!!!!!!!!!!!!!!!!!!!now my picture reviser will not work!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!oh my f**day!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!





Be back soon with the pics I'm so pissed

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Old 02-22-2009, 02:11 PM
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Hi,
It sounds as if it's (balancer) is on correctly, so beings washers are so unsightly, you may need to make spacers.
Rich
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Old 02-22-2009, 02:23 PM
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I have some small aluminum round stock that I could make the spacer but I'm wondering what is wrong with this balancer. I'm working on getting my pics up now.
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Old 02-22-2009, 03:59 PM
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SBC400 serpentine problem!!

stock water pump or after market ?
does it lign up with all else ? but the crank pully .
i'v seen the water pump be a 1/4 inch out .
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Old 02-22-2009, 06:05 PM
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Serpentine problem

Just got a wild one,,, Take 1/4 from balancer ...Measure your orig dimension .. 2cts worth. 327/350hp
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Old 02-22-2009, 10:19 PM
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at this point cutting the balancer has been running through my head over and over and I think this is the solution.
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Old 02-22-2009, 11:39 PM
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got it to work! the pics I mean



notice last pic DB electrical sent wrong alt.
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Last edited by TorkMonster400; 02-23-2009 at 12:23 AM.
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Old 02-23-2009, 06:00 AM
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You can`t cut the balancer. it would knock it out of balance and likely destroy the main bearings. Need more info on your serpentine system such as what did it come off of? did you get a complete set or a mixed set from a junk yard? Find a stock balancer and compare the lenths between it and the one you got from summit. Since I played with various serpentine systems I learned you can`t mix them, you have to get a complete set because all of them were not the same.
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Old 02-23-2009, 01:47 PM
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Full set from a 94 c1500 350. took every thing but the balancer and water pump. I took power steering and ac(not hooking up now). After doing some research I think you might be able to cut it because the weight doesn't change on the rotational balance apparently but I could be wrong.
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Old 02-23-2009, 02:31 PM
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Quote:
Originally Posted by TorkMonster400
at this point cutting the balancer has been running through my head over and over and I think this is the solution.

if you cut balancer , where you going to cut it ?
you will have to make it slide on more , so you would have to bore it deeper , right ?
so grind off the end of crank instead , right ?
this will make it slide on more .
is it a after market crank ?
maybe it's snout too long ?i see you have a stock pump , so thats not the problem unless the fan hub not pressed on enough ?
have you installed water pump pulley ? and does it line up with the other things like alternator ?
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Old 02-23-2009, 06:16 PM
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yes the water pump pulley is in line with every thing else just the balancer is off and I have considered taking the balancer to my friend at the machine shop and maybe he can lathe it down or something?
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Old 02-23-2009, 06:17 PM
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yes I do mean bore it deeper possibly?
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Old 02-23-2009, 07:23 PM
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Check it against a stock balancer and see if the snout that fits into the seal and against the timing gear is too long. You could trim it there if necessary, but make sure you have enough surface for the seal to ride on still if you do cut it. Cutting it there won't affect the balance.
Are you sure it is fully pressed on until the snout contacts the timing gear on the crank?
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Old 02-24-2009, 10:56 AM
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pretty sure its on all the way, I have another stock 400 in the shop I'm going to try to pull the balancer tomarrow. I put up the pics
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