Search found 168 matches

by Robert Bondi
Sat Nov 04, 2017 3:52 pm
Forum: Tech Forum
Topic: Sound proofing
Replies: 6
Views: 536

Within the last 4 years, I've rebuilt the internals of all 4 doors: door gaskets, weatherstripping, window brushes, lubrication, nylon bushing replacement, etc.....That work also included installing Dynamat under the door cards instead of the vapor barrier. The Dynamat 1/16" thick rubber with alumin...
by Robert Bondi
Sat Nov 04, 2017 3:34 pm
Forum: Tech Forum
Topic: " Ended" sources for finding parts NLA.
Replies: 7
Views: 810

I've got an NLA "wishlist". I continuously sprinkle requests for NLA parts into my parts orders. I've seen a couple come back. I recommend we all keep asking if you're in this for the long run. I've been told in several conversations over the years that BMW does keep track of parts requests, so ever...
by Robert Bondi
Mon Sep 11, 2017 12:39 am
Forum: Tech Forum
Topic: Large tube single row radiatirs
Replies: 5
Views: 430

Interesting. OK. When I purchased my radiator at Ron Davis 3 years ago, it seems like we were mostly talking about more tube rows than stock. Without some CAD images for reference, I wouldn't be surprised if we're somehow talking about the same thing. Anyway, I've been really happy with my radiator ...
by Robert Bondi
Sun Sep 10, 2017 4:01 pm
Forum: Tech Forum
Topic: Large tube single row radiatirs
Replies: 5
Views: 430

Lots of design parameters, but I wouldn't expect large tubes to generally be the right direction. Surface area for heat transfer is important and fewer larger tubes reduces that. There's obviously a balance between resistance to flow and surface area when selecting tube size and count. I bet that's ...
by Robert Bondi
Sun Sep 10, 2017 3:47 pm
Forum: Tech Forum
Topic: No quick start after fuel pump, filter replacement.
Replies: 5
Views: 425

Another trick I use to prime pump, adjust fuel pressure, or just trouble shoot is to use a small thin segment of solder (soft) and jump AFM pins 36 and 39, IIRC, on the FI harness connector to AFM. Solder is so soft you can then put the 7-pin connector back on the AFM. This has the same effect of op...
by Robert Bondi
Mon Jul 31, 2017 3:21 am
Forum: Tech Forum
Topic: O2 Sensors problem
Replies: 6
Views: 560

I retrofitted my 77 to use the late FI with the O2 sensor, but I'm pretty sure there is a reset switch that might need to be reset after changing the sensor. There is a reset switch on the inside of left frame rail on the 77 just under the driver - that box has a different purpose on the 77. Worth c...
by Robert Bondi
Mon Jul 31, 2017 3:15 am
Forum: Tech Forum
Topic: 91° and 99° temp switch on Radiator UPDATE
Replies: 3
Views: 399

Great. Glad it worked for you.
by Robert Bondi
Mon Jul 24, 2017 1:06 am
Forum: Tech Forum
Topic: 91° and 99° temp switch on Radiator UPDATE
Replies: 3
Views: 399

If you want the aux fan to come on near midpoint on the temp gauge, you actually need the 82C version of that same switch. I've calibrated midpoint on the T gauge to be about 80C. The 82C switch part number might be in my cooling system FAQ. If not, I've sourced it through places like BavAuto or BMP...
by Robert Bondi
Sun Jul 09, 2017 8:09 pm
Forum: Tech Forum
Topic: 81 528i - rough idle question
Replies: 4
Views: 436

The only thing that valve really does for you is adjust the idle speed when cold. The more that valve is open at cold start, the higher the idle speed will be. I'd fix your warm idle first. If you pinch off the hose coming out of that valve and going to the manifold when the car is warm, you'll elim...
by Robert Bondi
Sun Apr 02, 2017 11:41 am
Forum: Tech Forum
Topic: converting from 4 to 5 speed 260
Replies: 2
Views: 399

Re: converting from 4 to 5 speed 260

Hello. what other parts than a gearbox do i need to convert from 4 speed manual to 5 speed getrag 260 on a 1975 525? and how to put in speedo drive? Different driveshafts on 4 and 5 speed? Yeah, definitely a different (shorter) driveshaft needed for the 5 speed. I didn't need to change my speedo, b...
by Robert Bondi
Wed Mar 29, 2017 11:44 pm
Forum: Tech Forum
Topic: Warm running
Replies: 4
Views: 467

I think you'd want to make sure that it's really running that hot or if it is an issue with the sensor. There are a lot of subtle way to get tripped up. One non-obvious one is that there are at least two different versions of the thermostat (aside from the temperature spec) that seem to correspond t...
by Robert Bondi
Sun Feb 12, 2017 6:38 pm
Forum: Tech Forum
Topic: Replacing Front End Bushings
Replies: 10
Views: 1173

I did the entire front end 3-4 years ago. I believe you're forced to buy the entire front control arm with bushing these days. FWIW, the only front end pieces I couldn't separate on my own were the press fits between the control arms and the steering arm levers. The weird curvature of those steering...
by Robert Bondi
Sat Aug 20, 2016 10:47 pm
Forum: Tech Forum
Topic: Braking balance
Replies: 24
Views: 2397

A follow-up on this thread..... I essentially fixed the problem, although the reason for all the initial problems still really isn't clear. I simply bought another new left caliper. I spent some additional time bench testing the new caliper. I pulled off the boots, lubricated the piston lateral surf...
by Robert Bondi
Sat Aug 20, 2016 12:36 pm
Forum: Tech Forum
Topic: Subframe bolt torque?
Replies: 3
Views: 569

Re: Subframe bolt torque?

canada karl wrote:Couldn't find the torque value in the manual. Anyone know what it should be?
My factory manual shows 53-59 ft-lbs for "front axle carrier to body".
It actually seems kind of low given their size.
by Robert Bondi
Fri Aug 05, 2016 10:37 pm
Forum: Tech Forum
Topic: Buzzer noise- blower motor?
Replies: 6
Views: 766

I've attributed occasional episodes of RPM-dependent buzzing in the general driver side dash area to the speedometer cable. They are mechanical in these cars - just a square-cross section cable spinning inside a sheath. There's not a whole lot that can be done, except maybe get some graphite powder ...