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View Full Version : is it ok to use a hammer?



grumpyvette
06-04-03, 08:21 AM
RARELY DO I FEEL LIKE CRYING, but I got a question asked...
"is it ok to use a large hammer and block of wood to beat the damper back onto the crank when doing a cam swap"
that question gets me that frustrated



http://www.jegs.com/photos/71061744.jpg

heres the basic installation tool
http://www.northerntool.com/images/product/images/159413_lg.jpg
look at the picture carefully, the tool is available from several sources
http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=3324&prmenbr=361
heres how to use it...
the small 7/16 thread ,on the tool threads into the crank, the damper slips over the tool, the large washer style bearing slips over the tool followed by the solid washer followed by the large nut that threads on the tool, the back of the tool is normally a 9/16 or 5/8 hex this is held with a box end wrench to keep the engine from turning, the large nut is usually a 1 1/8" nut and it is tightened with an open end 1 1/8" wrench or a adjustable wrench against the two washers drawing the damper onto the crank snout! lube the threads on the tool, the inside of the damper and crank snout with oil before starting. the damper will normally slide on about 1/4 of the way bye hand then the tool is needed to draw the damper on the last 3/4 of the distance, don,t over tighten the tool the 7/16" thread will snap off in the crank after the damper bottoms out on the lower timing gear if you do!,[b]
NEVER USE A HAMMER AND BLOCK OF WOOD TO DRIVE THE DAMPER ON, YES THOUSANDS OF GUYS THINK THEY DID IT WITHOUT ANY PROBLEMS BUT...
IT WILL DAMAGE THE THRUST BEARING CLEARANCES,
IT CAN BREAK THE ELASTOMER TORSION RING ON STOCK DAMPERS
IT CAN CAUSE THE INERTIAL RING ON FLUIDAMPER TO BECOME JAMMED INTERNALLY
IT CAN CAUSE THE DAMPER TO FAIL.
IF THE DAMPER FAILS THE CRANK WILL EVENTUALLY BE DAMMAGED
IT GREATLY STRESSES THE CRANK SHAFT
IT CAN DAMAGE THE CRANKS TRANSMISSION PILOT BEARING
IT CAN DAMAGE THE TRANSNSMISSION
ALMOST EVERY TYPE OF DAMAGE IS NOT SOMETHING THAT SHOWS UP RIGHT AWAY, BUT IT WILL DANMAGE THE PARTS LISTED AND THERES THOUSANDS OF GUYS THAT ARE WONDERING WHY THOSE PARTS FAILED 6-24 MONTHs LATER WITH NO CLUE AS TO THE CAUSE!
ASK YOURSELF THIS QUESTION, IF CRANKSHAFTS THAT ARE A FEW THOUSANDS OUT OF LINE I.E. NOT PERFECTLY STRAIT ARE BENT/STRAITEND WITH A LEAD HAMMER BY CRANK MANUFACTURES (and yes thats how its done) AND CRANKS THAT ARE DROPPED ON A CONCRETE FLoOR SOMETIMES BEND SLIGHTLY ,(happends all the time) WHAT MAKES YOU THINK THAT BEATING ON THEM WITH A HAMMER AND A BLOCK OF WOOD WONT DAMMAGE THEM? AND WHILE WERE AT IT WHAT WOULD YOU DO TO SOME GUY YOU CAUGHT BEATING ON YOUR ENGINE BLOCK WITH A HAMMER? WELL WHAT DO YOU THINK THE CRANKS DOING TO YOUR MAIN CAPS WHEN YOU BEAT ON THE CRANK? PROPERLY USED THAT INSTALLATION TOOL CAN EXCERT OVER 15 TONS OF PRESSURE TO SLIDE THE DAMPER ON, IF IT WONT SLIDE ON, THERES A PROBLEM! FIND IT AND FIX IT .....DON,T BEAT ON THE DAMPER/CRANK

Ken
06-04-03, 11:32 AM
Thank you again Grumpy! :upthumbs

JohnZ
06-04-03, 07:58 PM
Very true for cranks drilled and tapped for the balancer bolt, but Chevy built about 20 million small-blocks without that hole, and a hammer is the only way to install balancers on those engines (and I've done a bunch of them in 40 years). I use a block of wood wedged between the crank rear flange and the engine stand to hold the crank forward (to avoid brinelling the thrust bearing surface), and install the balancer using a socket slightly larger than the hole in the balancer hub (not the ring) and a 4# plastic-coated shot-filled dead-blow hammer (multiple light blows) to drive the balancer on. I also measure the length of the crank snout forward of the cam sprocket and the depth of the hole in the balancer hub beforehand so I can tell by measuring with a depth gauge when the balancer is seated against the face of the sprocket (or spacer ring on a C1 engine) instead of just beating on it.

:beer

Ken
06-05-03, 12:07 AM
Thank you too John! :upthumbs

_ken :w