While I am in there

[tx63conv]

I am in the process of replacing both my speed and reference sensor for an 87 Carrera and based on the condition, I believe the CHT sensor may be original. I have not had any driving issues (other than the no start issue I am trying to resolve). Car has 111k miles and since I have the grommet out where the sensor wires pass into the engine bay, I wonder if I should change the CHT out as well.

Also, the plastic connector side of the CHT in the engine bay has broken. I assume this is part of a larger wiring harness and not easily replaceable.

[Flat6pac]

Check availability of the head sensor.
The reference sensors are available as BMW parts at a good savings
Just use Bosch, other brands are available but…
Bruce

[tx63conv]

Thanks Bruce. I bought the BMW sensors and have them installed. The Porsche brand CHT is available--there is an off brand for less than half but I would probably stick with the Porsche/Bosch.

[AlKidd]

Nothing good has ever come from that phrase.

[tx63conv]

I know that feeling hence the hesitation. The plastic was pretty brittle but I hate to change it out. Getting the plug on the firewall out was a little bit of a PITA but could be done again--although I sacrificed the speed and ref sensors by cutting them and giving the plug a little more flexibility.

I am more concerned about the broken connector in the pic--any solutions to this?

[theiceman]

if its the single wire CHT i would definitely change it

[tx63conv]

good question. I will check.

[wazzz]

I think this connector can be replaced. It looks like a Bosch standard connector fitted on other cars and makes. If you can read the Bosch part number stamped on it, google it.

[tx63conv]

Thanks for the input on the Bosch connector. Turns out the CHT is a two wire. Car is an 87 so I assume this was replaced at some point in its life? My plan is to button up the speed and ref sensor install and leave the CHT as is.

I will look into the Bosch connector to see if there is a part number. I need to invest in a magnifying glass--my readers arent doing the trick.

[Knight77911]

Originally Posted by AlKidd

Nothing good has ever come from that phrase.

I had to chuckle at your comment. It is probably the most expensive phrase I've ever said.

[Ok here we go]

Replaced my single lead original CHT with the URO version - clocked about 1500 hard-driven miles on it so far with no hiccups *knock on wood*

[GH85Carrera]

Originally Posted by AlKidd

Nothing good has ever come from that phrase.

Not true!

The head temp sensor is a perfect example of "while I am in there" smart move. Another is replacing the pilot bearing while doing a clutch.

That simple phrase does indeed have some great benefits.

"While I am in there" than get really expensive in a transmission or engine rebuild.

[hcoles]

Originally Posted by GH85Carrera

Not true!

The head temp sensor is a perfect example of "while I am in there" smart move. Another is replacing the pilot bearing while doing a clutch.

That simple phrase does indeed have some great benefits.

"While I am in there" than get really expensive in a transmission or engine rebuild.

Yes - while placing the starter ring.. why not do the clutch, pivot shaft and TOB/etc. Throw in a new starter as well. Who wants to pull the motor and trans out again?

[theiceman]

i will be the first to admit, i did not " throw in a clutch" while i had the engine out..
i measured wear limit spec new and my wear , and calculated it will be due in about 43 years,



that was about 5 years ago and still cruising.

[AlKidd]

My reply was a reference to the paths that many take after saying "while I'm in there" that attempt to "improve" or add more hp, not perform basic maintenance by replacing the likes of a pilot bushing. I hope no one is that cheap or such a complete hack to not change consumables while doing a clutch.

Originally Posted by GH85Carrera

Not true!

The head temp sensor is a perfect example of "while I am in there" smart move. Another is replacing the pilot bearing while doing a clutch.

That simple phrase does indeed have some great benefits.

"While I am in there" than get really expensive in a transmission or engine rebuild.

[GH85Carrera]

Originally Posted by AlKidd

My reply was a reference to the paths that many take after saying "while I'm in there" that attempt to "improve" or add more hp, not perform basic maintenance by replacing the likes of a pilot bushing. I hope no one is that cheap or such a complete hack to not change consumables while doing a clutch.

I understand. My top end engine rebuild had enough "while we are in there" moments it was a total rebuild. In the end, I am real happy we did a full rebuild, and I love my engine now. So I fully understand the pain of that simple phrase.