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M54 engine query please

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Pondrew
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M54 engine query please

Post by Pondrew » Sun Feb 11, 2024 9:42 pm

I need to add some extra gauges to my M54 3 litre engine, notably an oil temp and oil pressure gauge. I have been advised (by the gauge manufacturer) that there should be 'tap in' points on the engine for these.
Does anybody know if this is correct and if so, where they are? I don't know if both gauges can operate from a common sender/ sensor TBH.

Thanks
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M54 engine query please

Post by pvr » Sun Feb 11, 2024 9:50 pm

Quick Google shows it on the back of the oil filter housing. Seems to be a lot of hits on the E46 with that engine
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M54 engine query please

Post by Worcester_spoon » Sun Feb 11, 2024 9:52 pm

Ooh, I wasn’t aware there an easy way to do this. Would love an oil temp gauge given I have a supercharger fitted.

Pondrew, what gauges are you looking at?
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M54 engine query please

Post by Pondrew » Sun Feb 11, 2024 9:57 pm

Worcester_spoon wrote: Sun Feb 11, 2024 9:52 pm Pondrew, what gauges are you looking at?
ETB but they are bespoke ones not off-the-shelf. Copies of another brand but I can't say too much as it is a very 'cloak and dagger' world! :)
All good things come to those who wait. I'm really impatient which explains a lot.

F31 320i. Good car.
E89 20i Now fully dried
Z3 'free litre'. Project and a half. Complicated!
Mazda3 sold
Tatty old R56 Mini Cooper. Money pit!

Pondrew
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M54 engine query please

Post by Pondrew » Sun Feb 11, 2024 10:29 pm

Well what do you know?!..... :o
The sensor for the oil pressure is present and plugged in to the head. I traced the wires back and there is an open ended connector tied up at the rear of the engine, just under the rocker cover. Happy days! Thank Paul (PVR) I didn't think to Google it. :headbang:

Looks like the oil temp may be a bit more tricky, as it seems it needs to be taken from the sump. If need be I will swap my oil temp gauge for a voltmeter, that will be easy enough the wire. :D
All good things come to those who wait. I'm really impatient which explains a lot.

F31 320i. Good car.
E89 20i Now fully dried
Z3 'free litre'. Project and a half. Complicated!
Mazda3 sold
Tatty old R56 Mini Cooper. Money pit!

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M54 engine query please

Post by Zedebee » Sun Feb 11, 2024 11:51 pm

Oil temperature (1) and pressure (2) sensors are located at the base of the oil filter housing.
IMG_0048.png
IMG_0048.png (341.86 KiB) Viewed 318 times
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M54 engine query please

Post by Pondrew » Mon Feb 12, 2024 12:09 am

Zedebee wrote: Sun Feb 11, 2024 11:51 pm Oil temperature (1) and pressure (2) sensors are located at the base of the oil filter housing.
I always liked you! :thumbsup: :thumbsup: Thanks. :D

It's not an E85, though, but don't think it will be any different.

Edit: mine is not like the picture, there is no (2).
All good things come to those who wait. I'm really impatient which explains a lot.

F31 320i. Good car.
E89 20i Now fully dried
Z3 'free litre'. Project and a half. Complicated!
Mazda3 sold
Tatty old R56 Mini Cooper. Money pit!

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M54 engine query please

Post by Zedebee » Mon Feb 12, 2024 8:22 am

Pondrew wrote: Mon Feb 12, 2024 12:09 am
Zedebee wrote: Sun Feb 11, 2024 11:51 pm Oil temperature (1) and pressure (2) sensors are located at the base of the oil filter housing.
I always liked you! :thumbsup: :thumbsup: Thanks. :D

It's not an E85, though, but don't think it will be any different.

Edit: mine is not like the picture, there is no (2).
Odd. The reference picture for E36 Z3 3.0i is identical, except for the qualification “Figure shows power steering pump supply tank removed.” (1) and (2) are both shown.
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M54 engine query please

Post by Pondrew » Mon Feb 12, 2024 12:31 pm

Zedebee wrote: Mon Feb 12, 2024 8:22 am Odd. The reference picture for E36 Z3 3.0i is identical, except for the qualification “Figure shows power steering pump supply tank removed.” (1) and (2) are both shown.
Having had a another good look, I think number (2) may be under there. It's really hard to see as the power steering pipes from the reservoir are in the way.
All good things come to those who wait. I'm really impatient which explains a lot.

F31 320i. Good car.
E89 20i Now fully dried
Z3 'free litre'. Project and a half. Complicated!
Mazda3 sold
Tatty old R56 Mini Cooper. Money pit!

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M54 engine query please

Post by Zedebee » Mon Feb 12, 2024 2:06 pm

The sensor you found at the back of the valve block is likely the pressure sensor for the SMG transmission, which is why it isn’t wired up in your car. NewTIS doesn’t have a picture for this unfortunately, but does have the following info:

Pressure sensor
The pressure sensor is fitted directly on the valve block.

Via the pressure sensor, the SMG control unit recognises whether the oil pressure in the accumulator is sufficient and when the hydraulic pump has to be activated and/or switched off.

In order to ensure that the gearshifts run without any problems under all operating conditions, a certain oil pressure must be present in the system.

Brief description of components
The oil-pressure sensor is supplied with power via the sensor-supply voltage (5 V) from the SMG control unit.

The measuring range of the oil-pressure sensor lies between 0-80 bar. The evaluation is in the range of 35-40 bar, 44-55 bar and approx. 80 bar. The system pressure is approx. 44-55 bar.

The prevailing oil pressure and its change is picked up by the oil-pressure sensor, converted into a voltage signal and transferred via the information cable to the SMG control unit.
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Previously: Maldives Blue 2.5i manual (its back!) and another, and a Monaco Blue 3.0Si coupe

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M54 engine query please

Post by Pondrew » Mon Feb 12, 2024 3:41 pm

My engine (and car) is a 2000 model, did they have SMG autos as an option back then?

Looks like I will have to ask someone who has done the additional gauges where they got the voltage senders from. Unless most are just fake gauges of course!
All good things come to those who wait. I'm really impatient which explains a lot.

F31 320i. Good car.
E89 20i Now fully dried
Z3 'free litre'. Project and a half. Complicated!
Mazda3 sold
Tatty old R56 Mini Cooper. Money pit!

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M54 engine query please

Post by patriot66 » Mon Feb 12, 2024 3:55 pm

I think we may be getting a little confused here. The SMG Hydraulic system (valve block, pump, fluid reservoir, accumulator) is completely self contained and independent of the engine and is mounted on the side of the gearbox itself. (Not my photo)
s-l1200.jpg
s-l1200.jpg (104.71 KiB) Viewed 192 times
The temp sensor at the rear of the cylinder head (4 in my photo below) is secondary coolant temp sensor (13621433076) along with the other on the bottom hose connection into the thermostat (13621433077 - not in photo)
20170417_154928.jpg
20170417_154928.jpg (188.24 KiB) Viewed 192 times
1 is Oil temp sensor (13621433076), 2 is oil pressure switch (12618611273) and 3 is banjo bolt oil pipe feed to the VANOS. These are all in the oil filter housing casting itself. Note that the cylinder head coolant temp sensor 4 and oil temp sensor 1 are the same part number.
Also, you can purchase (from Demon Tweeks amongst others) oil temp sump plug adaptors. These are a sump plug with a threaded hole (various sizes) in the centre that will accept an oil temp sensor.
lma122_3.jpg
lma122_3.jpg (35.21 KiB) Viewed 192 times
https://www.demon-tweeks.com/lma-oil-te ... lsrc=aw.ds
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M54 engine query please

Post by pvr » Mon Feb 12, 2024 4:35 pm

The Z3 never had an SMG box though
Current:
911-50 Black - unique spec
X5M - 575 hp of fun in a V8
Abarth 595 Comp.
Golf Clipper - collectors item
Z4 3.0si Black Sapphire
VW ID.3

Previous:
Z4M Silver Grey - non flimper spec (gone to Bing)
Z4 3.0 Toledo

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