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Old 01-28-2003, 12:00 AM
Limey Simon's Avatar
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Post SBC Harmonic balancer - how to fit?

Another question for the experts... I'm trying to fit a harmonic balancer onto my crate 350 but it doesn't want to slide on. I've made the half-moon key fit into the slot OK, but it soon hits a tight shoulder as it goes on.

Is this a hammer-on tight fit or should it just slide on?? Don't want to beat it if that will damage? Any tips?? Please advise, thanks Limey.

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Old 01-28-2003, 12:13 AM
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as far as i know all sm.block applications should fit, but you might want to do a websearch on particular applications, and check your partnumber. i know 350 and 400 are different,
as far as sliding on goes, some will need a little help to be put in place, i prefer using the tread in the crank to slowly drive it in place, .if you hammer there is a chance you might damage your bearings.

also check if the hole is not damaged, in any way(on the balancer)

goodluck and regards Bas
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Old 01-28-2003, 12:59 AM
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Bas
Where would I look to check part no?? Any website you'd recommend?
I've got a Goodwrench (pre 86 4 bolt mains) crate 350 and I've been sold a GM#12551537
6-3/4" balancer.
Cheers, Simon
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Old 01-28-2003, 01:32 AM
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The balancer is a presss fit. There is a special tool to mount it.

Don't hammer as it will damage the center thrust bearing.

[ January 28, 2003: Message edited by: KULTULZ ]</p>
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Old 01-28-2003, 03:32 AM
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Limey, make sure you have a 350 balancer for your motor.Pre 87 should be the same. Make sure the crank and balancer hole surface are clean by using solvents and something like steel wool and then feel for any nicks or burrs that may need to be removed. Don't forget to look at your key as well as the key ways. You can make your own tool if there are threads in the end of your crank shaft and there should be. All you need is a bolt that is long enough to thread to bottom of the crank hole with the harmonic balancer started on the shaft and a srong washer and nut screwed to the bolt head. Then turn the nut which will apply the force to press the balancer in place. You need to hold the bolt head while doing this so it stays in place. You should have the correct bolt and washer to install as a safety feature in the same hole after removal of your "tool"

Trees
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Old 01-28-2003, 03:45 AM
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Limey, my book does not have your damper part # listed, but a 6 3/4 balancer was used on some 350 engines. Your timing mark should be 10 degrees before crank key way. The retaining bolt I mentioned is PN 3815933 (7/16"-20x21/4") and washer PN 14001829 or 14092217.

Trees
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Old 01-28-2003, 04:27 AM
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Thanks Guys - I'll make or buy the tool you suggest & clean up all the surfaces a little more carefully. I have the centre bolt/washer already.
Any further hints?? Cheers, Limey
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Old 01-28-2003, 04:43 AM
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Simon, try Moroso tool # 61744 available from Summit and other vendors. (approx $45.00 USD) It works like a champ and will not damage your balancer, thrust bearing, or even ding up any paint.
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Old 01-28-2003, 05:25 AM
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Try putting some anti-seize on the inside of the dampner, and put some oil on the seal side, you don't want to put the dampner in dry and mess up the seal.
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Old 01-28-2003, 01:31 PM
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one more thing you might want to do is gage the crank snout and ID of the damper??
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Old 01-28-2003, 01:53 PM
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Simon is in the same spot as i am, since we are living in europe, a parts order from summit might take about three weeks, and a $45 tool will cost about $150 , so i think he just has to make up something, or have the luck some local toolshop has these things in store.

as for how i do it , i welded a longer bolt to an original crankbolt, and used a 1 inch thick plate with boltholes for the balancer on it, this i slowly thread in to the crankshaft applying lots of coppergrease, this has worked for me.

anyhow, goodluck to you simon, and we might meet someday, plan on going to england these summer. for some countryside cruising and some big carfestival, don't know where exactly but i look it up and might let you know.

one other question, ever been to the big power meet in sweden (vasteras) been ther 2 years ago this was awesome , there were suposed to be 12000 cars.

wel goodluck. Bas
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Old 01-28-2003, 05:29 PM
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Limey, I did not do a good job describing the "tool".
what I shoud have said is get yourself a 7/16-20x 4" grade 5 bolt, nut and thick flat washer or just use the one you have, thread the nut all the way onto the bolt, install the washer, then thread the bolt into the the end of the crankshft after you have the balancer started and lined up. Hold the bolt head with one wrench and start tightening the nut against the washer (counter clockwise) The $45 tool works on the same principal, but has other bells and whistles.

Trees
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Old 01-29-2003, 12:27 AM
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Many thanks for the feedback guys - I'm sure I can sort it. I assume that the balancer hits a 'stop' once it is fully fitted & can't be wound on too far???

Bas - I'm in the 4th year of my 32 build but hopefully out & about for this summer. Not made it to Sweden yet but you never know. Limey
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Old 01-29-2003, 04:44 AM
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[quote]I assume that the balancer hits a 'stop' once it is fully fitted & can't be wound on too far???<hr></blockquote>

Yes...it will only press on so far. Check belt pulley alignment to make sure afterwards.

Do you guys have tool disributors over there such as Hazet, Stahlwille or Facom?
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Old 01-29-2003, 05:32 AM
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I smell an opportunity for a black market tool import export business!
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