A couple of weeks or so ago I discovered that the oil/water pump assembly on my "Hindenburg"s engine was roached.
Hindenburg Saturday 13 July 2024 4 by
Terry Prendergast, on Flickr
I had to buy some parts from Britain for it, and was happy to have them arrive last week, so pulled the old pump body out of my ultrasonic cleaner (which had removed the black paint someone had painted it with, and rebuilt it with new shaft, oil seal, mechanical water side seal and impeller, and bolt, and reinstalled it.
BMW bumbling 4 August 2024 by
Terry Prendergast, on Flickr
No annoying gaskets like on our old Jap bikes, just a thin smear of this stuff on the metal casting faces. Must be the right stuff, it's sold by Motobins in Britain especially for BMW's. It does work well.
BMW bumbling 4 August 2024 1 by
Terry Prendergast, on Flickr
I put the cleaned outer cover on it, and was happy.
BMW bumbling 4 August 2024 2 by
Terry Prendergast, on Flickr
My happiness was shattered after I filled the engine with fresh oil, K&N filter and the cooling system with fresh coolant. By this time it was getting late, but I wanted to fire it up. It started fine and ran well, but after a few minutes, the oil pressure light came on! Fcuk! Well I couldn't do much as it was getting dark, so this morning first up, I replaced the oil pressure switch with a new one and gave the connector a scrub with a wire "toothbrush" and brake cleaner. I fired it up again and ran it for 20-30 minutes for a few minutes at a time, switching it off, waiting a few minutes and starting it again to make sure the oil pressure light would come on then go off, and this time it stayed off. Woohoo!
I wanted to replace the exhaust header gaskets on the white BMW, as one was clearly leaking, and Spotty and I could only slop on some silicone when we installed the "new" engine, and it clearly didn't work as it had a "farty" sound when I rode it home from his place. There was also a couple of exhaust studs missing. We'd used bolts and that was perfectly acceptable, but as I had to sell my soul to buy the new pump parts anyway, I also bought some new exhaust gaskets and studs. I had considered just using 8mm threaded rod cut to size, but I did like that the BMW items had internal hex's so it made it easy to install them with my allen keys, and a little loctite. One internal thread in the engine was a bit suspect, so I ran an 8mm tap through it to make it easier to install the studs, and then installed the gaskets, with a little silicon to hold them in place.
BMW bumbling 4 August 2024 3 by
Terry Prendergast, on Flickr
BMW bumbling 4 August 2024 5 by
Terry Prendergast, on Flickr
I'm always impressed with how many tools it takes me to do something as simple as removing/reinstalling an exhaust system.........
BMW bumbling 4 August 2024 4 by
Terry Prendergast, on Flickr
Anyhoo, finally got the exhaust on, and while it was a little late for a long ride, I decided to take the silver BM for a quick ride to buy some smokes. I discovered as soon as I got out in the street that the front tyre was almost flat (a truly horrible feeling) so carefully rode to the nearest gas station and filled the tank, then pumped up the tyre. I fully rotated it to see if I'd picked up a nail or a screw, but I think it's just a leaking valve. Last time I rode it 2 months ago I'd had to pump up that tyre, but just assumed that it'd sat for awhile after it had caught fire before I bought it, so I guess it had plenty of time to go down again. I picked up my smokes, and did another 10 miles or so, and was happy that the bike ran great, with no oil pressure lights coming on.
I rode home and swapped bikes. Jumped on the white BMW and did the same lap, and it ran great too. I'm happy that both bikes are running well again, with no oil or coolant leaks.
BMW bumbling 4 August 2024 6 by
Terry Prendergast, on Flickr