Harmonic balancer/damper - How to remove and install
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===Without threaded damper bolt hole in crank=== | ===Without threaded damper bolt hole in crank=== | ||
| − | + | Some SBC engines from 1968 +/- a couple years came with the damper installed at the factory (by what means hasn't been determined, but likely a hydraulic press of some sort), but with no drilled and tapped hole in the crankshaft snout for a retainer bolt. Removal isn't affected by this; installation IS. | |
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| + | ====Drilling the snout==== | ||
| + | The ideal solution is to drill and tap the snout with 7/16-20 threads. This must be done correctly, with the hole drilled and tapped concentric to the crank c/l. If there's any question about this, let a machine shop handle the job. | ||
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| + | ====Hardware==== | ||
| + | Many recommend using an ARP damper bolt and washer. Torque it to their specs, or to 60 ft/lbs if using an OEM bolt/washer with clean oiled threads. If there is access to good quality grade 8 hardware, a 7/16-20 x 2.25" long bolt with a 1/4" thick washer can be used. | ||
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| + | ====Proceed without drilling the snout==== | ||
| + | If drilling/tapping the snout isn't possible, the hobbyist engine builder can install the damper using a block of wood and a heavy hammer or short sledge. This operation requires eye protection | ||
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| + | There are a couple things that will help ease the job. | ||
| + | *The damper is held on by a 0.0007"-0.0014" press fit. Heating the damper in 200º F hot water for 10 minutes will cause it to expand a bit. Also chilling the crank snout with a bag of ice will shrink it a bit. Between the two, the difference can be enough to really ease the installation. Avoid using a torch on the damper hub. The chance of overheating it is too great to risk damaging or outright ruining the damper in the opinion of some. | ||
| + | *Use a sturdy block of wood like a 4-5" thick slice of a wooden fence post or 4x4, use it grain-on, not across grain to help keep it from splitting- you'll be hitting it fairly hard in most cases, especially if no heat/cold is used. The wood is used to insulate the damper inner hub from the hammer blows. | ||
| + | {{warning|NEVER hit the damper on the outer ring- this can break the bond between the rubber and steel, making the damper useless. NEVER hit the damper metal to metal with a hammer. A damaged damper could fail, possibly causing personal injury and damage to the vehicle or even bystanders. Use gloves and [[Health and safety in the shop or garage#Eye protection|eye protection]]}} at a minimum. | ||
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{{Youcanedit}} | {{Youcanedit}} | ||
[[Category:Engine]] | [[Category:Engine]] | ||
[[Category:Undeveloped articles]] | [[Category:Undeveloped articles]] | ||
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