W111 Battery

I had recently noticed that the battery on the 250SE was not in good health. The battery disconnect switch I built a few years ago has a battery health indicator included. Even when connected to the trickle charger it was showing orange. I also noticed that the trickle charger would sometimes go into error mode. My battery tester showed that it was well below where it should be. I had only replaced the W111 battery in the 250SE about four years ago, which is a pretty short life.

I was never happy with the battery I put in the car […]

Waterfall to Bulli night drive

Last night was the February 20201 MBCNSW Night Drive.   This month’s route was Waterfall to Bulli.   The rain all through the week in Sydney had been raining, but it finished just before the start of the drive and the weather was actually good the whole time.   It probably kept a few people away though.

As usual there was a good mix of cars  – the expected bad weather did skew it more towards moderns than normal.   I took my 300SE along for this drive.   It was the first lone drive in the car since the new oil pump was fitted.  […]

M103 Oil Pump catastrophic failure

My 1986 300SE is now back in business with good oil pressure.   Turns out the reason why the oil pressure was low was a catastrophic failure of the oil pump itself.  In the last part, I had narrowed the problem down to most likely being the pump.   I assumed that something was either blocking the screen or the pressure relief valve was stuck.    At this point it was time to take the car to a professional mechanic to have a look.

On the M103, the engine has to be raised to remove the one piece sump.   Once the sump […]

W126 battery hold downs and Auxiliary fan resistor

When I restored the battery tray on my 560SEL, I noticed the W126 battery hold downs were missing. While the battery on the W126 sits quite snugly between the inner and outer firewalls, the hold downs are still important. On a serious bump the battery could short out against the bonnet for example.

These hold downs are the same as on the W123 and other models. I ordered a new one, thinking that at least having one in place would start, and I would look for a cheaper used one later. Turns out I needn’t’ have bothered as I found […]

More M103 low oil pressure troubleshooting

As a recap, my 1986 300SE started showing low oil pressure. I tried changing the oil and filter, replaced the sender and checked with a mechanical gauge. Still low oil pressure. I decided to do some final oil pressure troubleshooting before I took it into a mechanic to lift the engine and remove the sump.

I was advised on the ozBenz forum that another possible cause was the oiler tube for the camshaft coming loose. The oiler tube is held down by a couple of bolts that if overtightened can strip the threads. Since I don’t have a lot of […]

Testing M103 Oil pressure with a mechanical oil pressure gauge

In my last update, I had ruled out the sender unit when it came to the low oil pressure readings on my 300SE. My intention had been to take the car to a mechanic to test it on a mechanical oil pressure gauge. Two things changed that. Firstly, my area of Sydney went into lock down. Secondly, most mechanics are on holidays until after the new year. I therefore purchased my own mechanical oil pressure gauge off eBay.

I hooked up the gauge and sadly the results were much the same as the dashboard gauge. The mechanical oil pressure gauge […]

December 2020 Night Drive – Eastern Suburbs

The December night drive was the last official night drive of the year took us through the eastern suburbs. Yet again, the late night drive proved popular, as we had 25 registrations and a lot of cars show up on the day. The meeting point, at Bradfield Park (near Luna Park), under the Sydney Harbour bridge probably helped.

The meeting point also provided the opportunity for some nice photos with the bridge in the background. I took my 250SE which is nice to drive on warm summer nights with the top down.

There was a good range of cars from […]

M103 Oil pressure sender

A few weeks ago my 300SE started to show low oil pressure on the gauge. It happened all of a sudden while on a drive. At the time, I surmised that I had a dead M103 Oil pressure sender. They are apparently a common fault. I ordered a new one and fitted it today.

The M103 oil pressure sender can be found on the side of the oil filter housing at the back of the engine. Most of the threads you’ll find on the various forums are referred to the W124. Apparently on the W124 space is tight and it […]

My 560SEL’s selling dealer

My 560SEL was sold new by West Orange Motors, in Orange NSW. The original owner lived in Western Sydney, but had business in Orange and Dubbo. While it was sold new in Orange, it was serviced at Marshalls in Parramatta until 230,000km. Presumably, the car made a fair few trips up to Orange, Dubbo and the surrounding area over its life. The original stamp from West Orange motors is still in the service book. I can’t imagine that many 560SELs were sold outside the main dealers in Sydney, Sydney Eastern Suburbs, Melbourne City and suburbs like Toorak. The original owner […]

December 2020 W126 Price Guide – Australia

When I wrote my W126 buyers guide earlier in the year, I did not include price information. Pricing is very specific to each location and changes frequently. This W126 price guide covers my observations about the prices of W126s in Australia. Its likely to be valid for the next year or so.

There are a few factors that impact the price of a W126. Some models, years and options are worth more than others. This is particularly the case for the W126 which had different body styles, engines and even two distinct series. As an example, the V8 models are […]