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Interesting Stuff

Torque Screwdriver for worm gear hose clamps

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January 7, 2024

If you own a pre-OBD 2 BMW, especially an E30, there are three indispensable tools: a smoke machine for finding vacuum leaks, a radiator pressure tester for coolant leaks, and the focus of this post, a torque screwdriver for worm gear hose clamps. Older BMWs are from a generation that predates the use of...
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Alpine CM5905 CM5907 and CM5908 Radio Cassette Belt

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December 29, 2023

There really is no need to be paying $12+ bucks for a cassette drive belt. Most forsale just take advantage of the fact that they know the belt length and width, you don’t and for that you end up paying exponentially more. All you need to know is that the drive belt is a...
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Why coolant has a lifespan and how to test it

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December 25, 2023

You’ve likely read in the owner’s manual or heard about the specific time (X years) and mileage (Y miles) recommendations for changing your vehicle’s coolant. But have you ever wondered why? The primary, yet often overlooked reason, is electrolysis. In the galvanic series, aluminum is more anodic compared to steel. This means aluminum will...
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Alpine CM5905 and CM5907 Radio replacement switches

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November 30, 2023

Many people who restore old Alpine radios just keep taking switches from other radios; but in general, to get the best longevity, new switches should be used. The E-SWITCH TL6275BA2PQRG can be used with the use of custom 3D printed caps. To make the switch work, you will need to 3D print this cap...
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OBD1 E30 Diagnostics demystified

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November 24, 2023

Every wondered if you could connect an OBD scanner and get useful data out of the E30? Most forum posts will say you can only get codes, but that’s just simply not true. Snap on Ultra with a BM-1B Adapter (EAA0355L74A) and DA-5 OBD 1 adapter cable (EAX0068L01A). A little older, and less expensive...
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Affordable steel E30 Key blanks (PN 51211900892 for E12,E21,E23,E24,E28,E30)

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November 23, 2023

The biggest issue in north america is that most non-dealer replacement keys for the E12,E21,E23,E24,E28 and E30 are made of brass. Over time this brass gets weakened and ends up breaking off in the lock or ignition. In Europe, there are brands like the Silca HU50AP that are made of steel. Even with shipping,...
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VDO and Motometer E30 SI board Capacitor electronics and batteries (lithium battery board)

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October 18, 2023

To replace the batteries and capacitors on a lithium battery E30 SI board you will need: Two CR14250SE-FT batteries Three 100uF/16v axial capacitors One 10uF/16v radial capacitor One 47uF/16v radial capacitor When mounting the batteries, depending on production date, the double feet may be wider than original; this can be overcome by folding in...
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Modernized E30 Digitized Air Flow Meter (M20 AFM)

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August 29, 2023

Many E30 owners don’t realize that the airflow meter in their cars is a wear item. Though it has a wear profile with an exceptionally long use and time horizon, one that hasn’t been seen for decades, many E30s have now reached the point where their AFMs are beginning to fail. To determine the...
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BMW Radio CM5905 and CM5907 Alpine Radio Code Jumpers

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August 29, 2023

It only takes 2 screws to remove the bottom panel of a CM5905 or CM5907 Radio. There you will find the code jumpers; these jumpers, based on how they are soldered determine the radio code. Note where the jumpers are numbers 1-6 and 1-8 for each model of radio. Solder the CM5905 jumpers like...
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E30 V-belt drive belt tightening by Torque Spec

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August 29, 2023

Few individuals have a v-belt tension gauge, but it’s important to understand that proper tightness can be achieved using torque specifications. The recommended torque is 7-8Nm. However, many tend to overtighten. Before adjusting the star bolt, ensure that the component you’re adjusting (be it the PS pump, Alternator, or AC) is loose and can...
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