Previously, I removed the heads, cylinders, pistons, rings and connecting rods. I installed new rocker arm needle bearings to replace the broken bearing cages. I disassembled the heads and inspected the valves and seats. You can read how I did that work here.
- 11 BMW 1977 R100RS Remove Pistons, Connecting Rods & Inspect
- 11 BMW 1977 R100RS Replace Rocker Needle Bearings, Remove Valves & Inspect
You can read about how I did this work here:
Top End Rebuild Work
I had the Nikasil cylinders replated and honed to match the new high compression (9.5:1) pistons. I had the connecting rods refurbished and I had the heads rebuilt. So now it’s time to put it all back together again.
The cylinders had the push rod tubes and the two short studs at the 12:00 and 6:00 position of the heads removed, so I also have to install them.
I started from this:
Ready To Remove Heads & Cylinders
Engine Out of Frame
Piston Crown with Carbon
Rod Components
Score in Right Cap Bearing Sheel
Right Side Crankshaft Throw
Cylinder Grunge
Left Exhaust Lower Rocker-Recovered Needle Bearings and Cage Pieces
Right Intake Rocker Busing
Right Intake Rocker Shaft
Valve Assembly Components
And finished with this:
Push Rod Tubes Installed
Piston with Rings Installed
Sliding Cylinder and Piston onto Long Cylinder Studs
Ready to Snug Cylinder to Engine Block-Push Rod Tube Rubbers Started
Left Head Orientation-Exhaust to Front
Top End Installed
Valve Cover Installed
nice work,Thanks for posting
Don,
Thank you. I hope this is helpful to those who follow.
Best.
Brook.
Did you replace the small end bearings the bronze ones ? and how did you do that I find that they get loose on the Piston pins! Did you replace the cam chain that’s always a good thing to do…
Instead of buying Pistons 9.5 I think I would just shave the head about .030 where did you get the rechroming cylinders done?
Great looking engine though on the outside probably will be very good for at least a hundred thousand miles
Hi Fraser,
Tom Cutter at rubber chicken racing garage installed the new small end bushings and honed them to fit the gudgeon pins.
Yes, I replaced the timing chain several months ago. I documented that and you will find the link on the right side of any of my pages.
No, I’m not interested in potential problems with valve clearance and changes to squish bands, etc. The pistons were pitted anyway so I bought BMW 9.5:1 pistons they sell in Europe, but not the US, for use with Nikasil cylinders.
Tom Cutter has an arrangement with a firm that bores and does the Nikasil plating to Tom’s clearance specifications. I’ve seen a couple advertisements for firms that do Nikasil plating in the US. I think a Google search will find them.
Thank you. The project is coming along.
Best.
Brook.