Harold Bawlzangya Racing

HBR – Crank Seal Retainer System (patent pending) Model 392

Logic told me that the crank seals weren’t going to blow out of the cases with the retaining lip removed.  But I had the time, material and paranoia to try to add some peace of mind to this modification.  Born is the HBR-CSRS model 392.

For the clutch side, I used some acrylic to mock-up what the retainer would look like:

plasticprototype

(click picture to enlarge)

Originally I was going to use 1/2″ aluminum and machine away most of it for the necessary clearances.  I wouldn’t have to bend anything and the differences between where the retainer bolted to the cases and where it rested against the seal would be easy enough to work out.

halfinchprototype

(click picture to enlarge)

But I took a quick stab at making one out of thinner aluminum and seeing if I could get the bends correct.  I think it was more luck than anything but I got this worked out:

FinalVersion

(click picture to enlarge)

I added this drain channel to the backside.  This isn’t so much for oil to drain out but rather to give the sediment from the worn clutch friction material a place to drain away. It just seems like a bad idea to have that abrasive material collecting near the crank seal.

ClutchSideRetainer-Channel

(click picture to enlarge)

Other than removing the factory cast retaining lips,

RetainerClutchSideBefore (1)

(click picture to enlarge)

I put this notch in the alignment dowel part of the case:

RetainerClutchSideBefore (2)

(click picture to enlarge)

The retainer fits into this notch,

RetainerClutchSideInstalled (1)

(click picture to enlarge)

And then bolts into place on top of the existing oil receiver:

RetainerClutchSideInstalled (2)

(click picture to enlarge)

Inside view:

RetainerClutchBackside

(click picture to enlarge)

Flywheel side was a little easier. Using a spare, I removed the electronics and started with this:

FlywheelSealRetainer (2)

(click picture to enlarge)

Put it on the scanner and cut out a template:

RetainerFlywheelSideTemplate

(click picture to enlarge)

RetainerFlywheelSideTraceOut (2)

(click picture to enlarge)

RetainerFlywheelSideTraceOut (1)

(click picture to enlarge)

After some work I had this:

FlywheelRetainer (2)

(click picture to enlarge)

FlywheelRetainer (1)

(click picture to enlarge)

Ready to bolt on:

RetainerFlywheelSideInstalled (3)

(click picture to enlarge)

RetainerFlywheelSideInstalled (4)

(click picture to enlarge)

With the retaining lip removed:

RetainerFlywheelSideInstalled (2)

(click picture to enlarge)

Installed:

RetainerFlywheelSideInstalled (5)

(click picture to enlarge)

RetainerFlywheelSideInstalled (1)

(click picture to enlarge)

Now I’ve got the peace of mind that the seals won’t push out, yet with the removal of a few bolts I can still service them.

 

 

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s