I recently did a trip to a hilly area with my 1985 BJ73 3B. We know, the 3B is not good at inclines.
On the highway I had to shift down to 3rd and pull into the emergency line to allow faster traffic to pass. At full throttle I was doing like 60km/h only.
The engine was working hard. At some point you cold like smell it and I stopped and had it ideling to cool down.
My factory temperature gauge however did not show any change of engine temperature at all.
It comes up to halfway when the engine warms up, and that's where it sits. Allways... Never ever came any higher, not even in this extreme situation. That can't be right...
That gauge obviously doesn't warn when the engine starts overheating. I need to fix this. But how?
- I will replace the temp sender unit. See below question on what sender to use.
- I tried to check the gauge as instructed by the manual: When connecting that single contact from the temp sender with a Voltmeter, it should 'swing around 3.5V'.
Apparently that thing is pulsed somewhat. When I did as indicated, my digital Voltmeter gave random readings between 0.8V and 8V.
Obviously that test method was designed for old fashioned inductor Voltmeter, with a reasonable delay in pointer reaction.
And what would it help? A new gauge is not available anyway.
So, I tend to go for a modern aftermarket gauge setup.
I can't find any with a M16 thread on the sender that would fit the original mounting, though...
Questions
Can I plug a modern gauge to the original sender, or have sender and gauge to be a consistent pair?
(I saw many different sizes in senders being generally available, but never any specific information concerning the measurement characteristics, like e.g. resistance.
Are those standardized?)
Where / how did you guys mount an aftermarket temp gauge & temp sensor?
Would be great if I could have the factory gauge in parallel.
There is another temp sensor referred to as 'oil temperature' (2 pins, 89422-30020 / 89422-12010) , although it also sits in the coolant circle right next to the water temp sensor . What does that do in a 3B, as I haven't an oil temperature gauge?
Would that be any help in detecting engine overheating?
Thanks for advice
Cheers
Ralf
On the highway I had to shift down to 3rd and pull into the emergency line to allow faster traffic to pass. At full throttle I was doing like 60km/h only.
The engine was working hard. At some point you cold like smell it and I stopped and had it ideling to cool down.
My factory temperature gauge however did not show any change of engine temperature at all.
It comes up to halfway when the engine warms up, and that's where it sits. Allways... Never ever came any higher, not even in this extreme situation. That can't be right...
That gauge obviously doesn't warn when the engine starts overheating. I need to fix this. But how?
- I will replace the temp sender unit. See below question on what sender to use.
- I tried to check the gauge as instructed by the manual: When connecting that single contact from the temp sender with a Voltmeter, it should 'swing around 3.5V'.
Apparently that thing is pulsed somewhat. When I did as indicated, my digital Voltmeter gave random readings between 0.8V and 8V.
Obviously that test method was designed for old fashioned inductor Voltmeter, with a reasonable delay in pointer reaction.
And what would it help? A new gauge is not available anyway.
So, I tend to go for a modern aftermarket gauge setup.
I can't find any with a M16 thread on the sender that would fit the original mounting, though...
Questions
Can I plug a modern gauge to the original sender, or have sender and gauge to be a consistent pair?
(I saw many different sizes in senders being generally available, but never any specific information concerning the measurement characteristics, like e.g. resistance.
Are those standardized?)
Where / how did you guys mount an aftermarket temp gauge & temp sensor?
Would be great if I could have the factory gauge in parallel.
There is another temp sensor referred to as 'oil temperature' (2 pins, 89422-30020 / 89422-12010) , although it also sits in the coolant circle right next to the water temp sensor . What does that do in a 3B, as I haven't an oil temperature gauge?
Would that be any help in detecting engine overheating?
Thanks for advice
Cheers
Ralf
), using a bracket fixed by the bolts of the aux cluster. Temporary by now, as I need to find a decent housing, still.
