Archive for the ‘Bellhousing’ Category

Custom QuickTime Bellhousing Pocket Covers

Saturday, November 28th, 2009

My only complaint about the Quik Time bellhousing is the openings on both sides.  In my opinion, this leaves the clutch and throw-out bearing susceptible to road dirt and debris.  Perhaps this would be fine for a race car but the Trans Am will certainly be a street car.  The opening on the starter side has proved extremely helpful when setting up the high torque starter.  This opening allows the backlash to be set without removing the bellhousing.   I contacted Quick Time about this issue and spoke with Ross Mccombs, the CEO.  Ross claimed that the openings would be fine even for a street car as they would allow clutch dust and heat to escape.  I however feel more comfortable keeping the bellhousing closed.  The stock bellhousings were sealed and have worked fine on thousands of cars for many years.  My guess is that they’ve received complaints about this as Ross informed me that they will now be welding pocket covers on all bellhousings .  He offered to replace my bellhousing with one that has been welded up.  I thought this was a great gesture but didn’t want lose the opening for the starter in case it ever needed to be replaced.  I also didn’t want to replace the bellhousing since it had already been dialed in.   He then offered to send the covers at no charge.  I decided to modify the covers with flanges on each side so that they could be unbolted if needed.   The fitment of the covers was horrible.  It’s a good thing I wasn’t going to weld them to the bellhousing.  I probably couldn’t have if I wanted to since there were gaps on each side almost 0.25″ wide.  At least it was a good starting point.  I can’t really complain though since they were free.  As the saying goes, never look a gift horse in the mouth.

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Offset Dowel Pins

Sunday, November 22nd, 2009

The standard dowel pins had to be removed from the Trans Am’s block.  As you can see in the first picture below, there’s not much engagement for the QuickTime bellhousing after the backing plate is installed.  The new Lakewood offset dowel pins were quite a bit longer which solved this problem.  First attempt at removing the stock dowel pins with vice grips was unsuccessful.  The bellhousing backing plate was too thick to get a good grip on the dowels pins.  Finally the dowel pins were drilled and tapped in order to use a slide hammer for removal.  The pins were case hardened so a few thousands had to be ground from the surface with an air grinder for the drill bit to start.  Some old spare nuts and collars were welded to to a socket head screw in order to use the slide hammer.  The Lakewood dowel pins were easy to install.  The extra money spent proved to be well worth it.  The flats on the pins were undoubtedly easier to adjust than a slot for a screwdriver on cheaper offset pins.  I still think I could have dialed the bellhousing in more accurately.  With frustration setting in after a few hours, I finally had to settle on .004″ offset which is just under the .005″ spec.  After the bellhousing was dialed in, the dowel pins were locked in to place with a socket head screw running through the center.  The bellhousing was removed again for clutch installation.  The clutch, pressure plate, and bellhousings were then put back in place for final assembly.

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Quicktime Bellhousing

Sunday, November 15th, 2009

Today the QuickTime bellhousing was mounted to the block to check for runout.  The supplied backing plate was installed behind the flywheel.  The flywheel was then installed and bolts were torqued to 95 ft-lbs.  The bellhousing bolts were then torqued to 40 ft-lbs.  A dial indicator was placed on the flywheel (without the clutch in place) with a magnetic base to check runout.  Instructions call for a maximum of .005″ offset.  The crank was turned over until the highest reading on the dial was achieved.  The indicator was zeroed and the reading was taken again.  Highest reading was .031″.  The reading divided by two or .015″  is the total offset.  A set of Lakewood offset dowel pins were ordered to correct this.   The offset dowels were expensive but I beleive they’ll be well worth the money spent.  The offset portion rotates freely from the portion inside the block.  The dowel has two flats enabling the use of a wrench instead of a flat head screw driver.  When the proper location is acheived, a set screw locks everything in place.

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