replace lower chain guides and timing chain

[bret962]

Hi, I want to replace the lower timing chain guides and timing chain on my 1994 325is. I have most things worked out on the procedure except replacing the lower chain guide on the passenger side. The one that goes up into the head.
I have read that the head must be removed to replace this guide. I'm only assuming this is said because the guide that goes up into the head doesn't have enough clearance in the head for the guide to slide off the pin it rides on. BMW calls this pin a bearing bolt, and the chain guide bearing bolt that is on the passenger side isn't threaded. It's pressed in, and has a current replacement number of 11111722324. With the above info I have mentioned I have a question.

As far as the chain guide not coming out with the head on. I can see that the chain guide on the passenger side might not slide out far enough to slide off the pin (bearing bolt) that's supporting it. But what if I just pulled that pin out. Then slide the old guide straight down out of the head. Slide the new one up into place and install a new pin. Has anyone done this? Or even removed that pin for any reason. I would need to pull the pin with the chain guide still on it. This is the part I see most difficult. Is it fairly easy to remove? A special tool?

Any info on this would be much appreciated!
Bret

[blckstrm]

I had the same question and couldn't ever find a definitive answer. With 270k miles on the clock I wanted to do a lot of rebuilding while I was in there (new upgraded Achilles oil pump, pan baffle, rod bearings - everything you could do while you're in there).

After looking even deeper and considering a full rebuild (since I wasn't sure I could get it out without pulling the head, and at that point figured I might as well do it all on a stand, and do everything this tired motor needed...) I ultimately decided to do an S54 swap.

On an S52 the pin is threaded (or at least the one I was worried about was), and I wasn't sure if I could wiggle it enough to get at the nut.

Anyway, good luck on getting an answer. Please report back if you go for it.

[XnWarden]

That press fit is quite snug. I haven't personally removed it, but you would need specialized equipment for sure to not damage anything. Just pull the head.

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