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Old 04-25-2013, 04:32 PM   #1
cameron110 OP
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Resurrection of a Mongrel /5

So something followed me home this afternoon...



Not sure where this project is headed but as you will soon see this is far from original so if you are looking for a loving restoration to factory spec you may as well quit reading now.

Not seen in this photo are a seat in nice shape but recovered, amazingly the pan is solid, both fenders and a front fairing with thrashed windscreen.
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Old 04-25-2013, 04:36 PM   #2
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What year? What model? What are your plans?

The fun begins. We enjoy these threads.
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Old 04-25-2013, 04:45 PM   #3
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The back story that this 1970 Short wheelbase /5 frame with a miss matched motor was running when parked a bit more than a year ago but was parked because an electrical issue caused the starter to no longer work when triggered. I wasted no time and dug right in for a bit of a closer look, no real disassembly today (that will be tomorrow morning)







not quite the factory wiring



or the factory key
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Old 04-25-2013, 04:52 PM   #4
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The plans for now are to tear it all the way down evaluate whats too worn to use and what's missing and then decide where to go from there.

For now lets take a closer look at the wiring.











Most of the stuff is reasonably recognisable but I'm not sure what these two black cylnders are. Thoughts

First impression is that the homemade harness is reasonably well thought out and carefully assembled, but I'll be building my own all the same
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cameron110 screwed with this post 04-25-2013 at 05:02 PM
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Old 04-25-2013, 05:02 PM   #5
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Now lets see what the fluids have to tell us.



final drive oil looks reasonable, no hints of water



No huge shards on the magnet, but I'll crack in there soon anyway.





Same story on the trans, the photo makes it look a bit creamy but it actually was not at all which is pretty impressive considering the mongrel spent the last year under a tarp.

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Old 04-25-2013, 05:08 PM   #6
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Wow, that harness is something else. Just so you know, BMW sells /5 harnesses for short money. Like, well under $100. Seems like everyone is finding old /5 basket cases these days. I just got one myself a couple months ago. I'll look forward to seeing your updates.
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Old 04-25-2013, 05:16 PM   #7
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Originally Posted by JonnyCash View Post
Wow, that harness is something else. Just so you know, BMW sells /5 harnesses for short money. Like, well under $100. Seems like everyone is finding old /5 basket cases these days. I just got one myself a couple months ago. I'll look forward to seeing your updates.
Part of why I am excited about this project is the need to build a harness, I think it will be fun.

What did you end up doing with your's is it on the street yet?
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Old 04-25-2013, 05:13 PM   #8
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The gauge is shot



I'm considering several possibilities for this, more on that later.
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Old 04-27-2013, 08:29 AM   #9
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Old 04-27-2013, 11:00 AM   #10
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Here are some of the photos from yesterday's teardown, I'll get the sad ones out of the way first







but this looks good and un-hacked



Not sure if this was a factory bar but the construction is interesting



One more view of the harness



The most amusing part of the day is where the two wrist pin retainers leapt to when removed





it wouldn't have been nearly as funny if they had made it down the holes

I'll get a closer look at those bores next week and have a peak at the transmission and final drive as well. In the mean time the frame and harness are in the basement for further investigation and the start of planning for a new set up.
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Old 04-27-2013, 12:09 PM   #11
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What I don't understand is why does someone elses pile of parts look so much more attractive than what we already have?
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Old 05-07-2013, 07:32 PM   #12
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I have been remiss in posting updates, sorry...

A bit more tear-down has been completed the crank is out and looks good the cylinder bores not so much. I have forgotten to take my camera a couple times, but I'll get some shots up before too long. Looking at the price of going up a size with the pistons and rings I'm not sure that is the best choice. There are some possibilities lurking out there in the darkness, 800cc nikasil or 1000 cc iron. I am going to try make a decision and get a parts order together next week for the various consumables so that some basic engine building can start.

Also on the to do list is to build a cabinet for the soda blaster so I can finish getting the flat black paint and the rest of the 30 years of grime off the block.

I've also been looking at possibilities for building a wiring harness. A friend suggested the idea of building it off an arduino to control everything centrally like a modern bike. I did some hunting around on the web this evening and at first glance it looks like it could work and would be pretty slick. Any of you FF ever played with arduino boards?
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Old 05-08-2013, 01:54 AM   #13
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Quote:
Originally Posted by cameron110 View Post
I've also been looking at possibilities for building a wiring harness. A friend suggested the idea of building it off an arduino to control everything centrally like a modern bike. I did some hunting around on the web this evening and at first glance it looks like it could work and would be pretty slick. Any of you FF ever played with arduino boards?
This is an old /5. More in line with a Ouija board...

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Old 05-28-2013, 08:09 PM   #14
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Quote:
Originally Posted by cameron110 View Post
Here are some of the photos from yesterday's teardown, I'll get the sad ones out of the way first







but this looks good and un-hacked



Not sure if this was a factory bar but the construction is interesting



One more view of the harness



The most amusing part of the day is where the two wrist pin retainers leapt to when removed





it wouldn't have been nearly as funny if they had made it down the holes

I'll get a closer look at those bores next week and have a peak at the transmission and final drive as well. In the mean time the frame and harness are in the basement for further investigation and the start of planning for a new set up.
Wrist pin retainers are never re-used. Toss the old ones now to avoid mix up.

The size of the spigots in the block limit what you can do in larger jugs. I have run 900 jugs in a 75/5 block. Some say it's a no-no . The block was bored larger in anticipation of the larger displacement the following model year (the /6) but the crank is not as stiff. I had no problems, including running it pretty hard.

Looks like very little corrosion on the exterior aluminum. This is good.
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Old 05-09-2013, 07:10 PM   #15
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This is the OEM wiring harness sold by max BMW for $65.12. They have been very popular of late but most think the price will go way up when the current supply runs out and they have to make another run;

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