Tag Archives: 1973 BMW R75/5 Rebuild Blogs

1973 R75/5 Rebuild: Remove/Install Flywheel, Replace Rear Main Seal, Oil Pump Cover and O-ring

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I posted a new page on removing the flywheel, replacing the rear main seal, oil pump cover and cover o-ring and installing the flywheel. This also covers a repair to a leak I found in one of the crankshaft flywheel bolt holes.

The work I did was guided by a lot of advice and web content shared by others who have gone before me.  I’d like to acknowledge folks who regularly participate on the BMW Airhead forum on Micapeak.  In particular, Tom Cutter who runs  Rubber Chicken Racing Garage and Bob (Snowbum) Fleischer who has a great technical library on all things BMW motorcycles, answered questions I posted on the Micapeak forum and in personal Email and phone conversations.  I also used web materials posted on  Duane Ausherman’s site.

Here a few pictures from the write up.

Make-do Engine Stand

Make-do Engine Stand

10mm Long Bolt in Alternator to Block Crackshaft

10mm Long Bolt in Alternator to Block Crackshaft

Flywheel Bolts out And Oil Leaking

Flywheel Bolts Out And Oil Leaking From Crankshaft Hole

Removing Oil Pump Cover with Impact Driver

Removing Oil Pump Cover with Impact Driver

Tightening Bolt to Pull Rear Main Seal

Tightening Bolt to Pull Rear Main Seal

Heated to 220 F

Heating Flywheel Bolt Circle to 220 F Prior To Installation

1973 BMW R75/5: Replacing Steering Head Bearings

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I wrote up the procedure I used to replace the steering head bearings in this web page:

At this point, the project is turning around from disassembly to reassembly as I installed the steering stem with polished lower triple clamp and new top chrome dust cover in the recently powder coated frame. 🙂

Here are a few of the many pictures you will find in the web page write up.

Fork tubes removed

Steering Head After Forks Removed

Steering Stem

Steering Stem Showing Top Bearing

BMW Steering Head Race puller

BMW Steering Head Race puller

Old Race-Vertical Bands Indicate Brinelling

Top Race with Vertical Bands Indicating Brinelling

Bottom Bearing Slipped On and Seated on the Steering Stem

Bottom Bearing Slipped On and Seated on the Steering Stem

Top & Bottom Bearings Packed with Grease

Top & Bottom Bearings Packed with Grease

Slotted Nut-Correct Orientation

Slotted Nut-Correct Orientation

1973 BMW R75/5 Rebuild: Replace Swing Arm Bearings & Powder Coat

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In page 02 BMW R75/5 General Tear Down, I show how to remove the swing arm from the transmission and the rear drive from the swing arm. This page covers removal and replacement of the swing arm bearings and races and the powder coating of the swing arm.

Here’s a link to the page I wrote up.

And a sample of some of the pictures.

Cycle Works Swing Arm Bearing Puller Kit

Cycle Works Swing Arm Bearing Puller Kit

Removing the Spacer

Removing the Spacer

Puller Positioned to Remove the Dust Seal

Puller Positioned to Remove the Dust Seal

Progresso Soup Can "Sock" Over the Universal Joint

Progresso Soup Can “Sock” Over the Universal Joint

Powder Coated Swing Arm

Powder Coated Swing Arm

Swing Arm Bearing Parts-Top to Bottom, Inside to Outside

Swing Arm Bearing Parts-Top to Bottom, Inside to Outside, Left is Drive Shaft Side, Right is Shock Side

Shock Side, Bearing Race and Grease Cap Installed

Shock Side Showing Bearing Race and Grease Cover Installed

Swing Arm Bearing Installed

Swing Arm Bearing Installed

Dust Seal with Sleeve Installed

Dust Seal with Sleeve Installed

1973 BMW R75/5: Refinishing Rear Shocks

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I removed and inspected the Boge rear shocks to see if they could be used. I really wanted to retain the stock chrome shock covers if possible. I decided they are still serviceable, so I refinished them including powder coating the springs and removing the deep scratches in the shock covers. I wrote up a web page on this you can find on the right side of the page, and here is the direct link to it.

Below are a couple of the pictures included in the web page write up.

Dull, Dirty and Scratched

Dull, Dirty and Scratched

Hose Clamp Spring Compressor

Hose Clamp Spring Compressor

Shackle and Spring Removed

Shackle and Spring Removed

Polished & Powder Coated Parts

Polished & Powder Coated Parts

Refinished Shock

Refinished Shock

1973 BMW R75/5: Repairing Stripped Threads in Handlebar Assembly

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As I was putting the handlebar assemblies back together, I discovered a stripped thread in the casting that holds the pinch bolt. I did a HeliCoil repair, which is the first time I have had to repair threads in an expensive part.  

I wrote up a web page on the repair you can find in the column of web pages on the right and here is the link:

Here are a couple the pictures I took along the way.

Striped Threads & Compression Bolt

Stripped Thread & Compression Bolt

Threading Heilcoil Tap

Running Tap in from Back Side of Assembly

Threading Insert into Tapped Hole

Threading the Insert into Tapped Hole From Backside of Assembly

Here are the finished left and right hand handlebar assemblies with new powder coating and polished levers.  I think they are going to look very nice on the new handlebar.

Assembled Left Side Clutch Assembly

Assembled Left Side Clutch Assembly

Assembled Right Side Throttle Assembly

Assembled Right Side Throttle Assembly