Category E31

Below you can see some photos from a 4HP-24 rebuild.

When draining the cooling system in the 750i no fluid came out when unscrewing the radiator bolt. I stuck  a small screwdriver in the hole and out came radiator leak stopper. Yuck. I then opened the thermostat housing to inspect thermostat.…

You can replace the pin with an M10 bolt and a locking nut, then tighten it just enough to get rid of the play.

Door seals on a 20+ years old car are usually pretty bad, with the one for the drivers door being the worst. Except wear they also shrink. I bought some used door seals from an E60 and used in my…

Lumpy idle? Check your distributor caps and rotors. Here’s what mine looked like after 289000 km in service, they’re stamped ’93… Notice the lack of carbon pins in the middle.

George Fontes has put together a good guide (PDF here) for re-sealing the intake gaskets on the M70. I followed this guide myself at times, but here are some additions and enhancements: When removing the fuel rail and injectors, here’s…

While you’re re-sealing the intake manifold gaskets go ahead and change the valve cover gaskets as well, I bet they look kind of like this: Valve cover gaskets after removal. Inside of left valvecover, every part of the crankcase ventilation…

While changing valve cover gaskets and re-sealing the intake manifold mounts I decided on cleaning the throttle valve assemblies as well. Disassembly is pretty straight forward. Clean everything meticulously and you’ll be fine. I blasted the housings while I was…