Club 80-90 Forums

This item comes off a Pierburg carb. It's some sort of a heater.
What does it actually do, and how do l test it off vehicle?
Regards
Stuart

Put power to it
+12vc to the fly lead and -12vdc to the bracket where the screw hole is , and it should get hot , don’t touch it hot!

Mocki wrote:Put power to it
+12vc to the fly lead and -12vdc to the bracket where the screw hole is , and it should get hot , don’t touch it hot!

Cheers Steve, lve tested two that way and both failed to get hot. It should be immediate surely?
Besides what do they do? And are they important to have working?
.

It's the pre-heater for cold starts on the carb. not really necessary for the UK moderate temps but for colder climes it is good to have it on.

Don't throw it away. Post it for sale or trade or giveaway for people trying to refurb old Pierburg carbs

Thanks for the info. Its the testing that is causing a headache.
I would have thought when adding 12 volts one could feel warmth from it. Yet nothing on two lve tested, and a third tested by another forum user gave same result.

It's not just for cold starting, but an anti-icing heater during warm-up phase, and it is beneficial in the UK in some weather conditions. Best tested by measuring resistance - don't know what it should be but if there is any reading (continuity) it's probably ok.

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Sounds odd that 3 tested all failed to heat up.
testing method?
I refurbbed 2 Pierburgs last summer which was 'fun' - but the right thing to do as now the van starts up well and runs well. I bought the spare on ebay to learn and then sold it on when it was refurbbed. (BTW Mocki saved my a$$ with sending me a spare resin choke piece to replace the orig that broke when disassembling the carb. Now that was a nightmare. Thanks Mocki!!!)

But I didn't bother to test either of the pre-heaters...

Maybe someone else has an idea of testing and/or failure rates? I did note that the wiring on the pre-heater looked easily broken/hard to repair.

ajsimmo wrote:It's not just for cold starting, but an anti-icing heater during warm-up phase, and it is beneficial in the UK in some weather conditions. Best tested by measuring resistance - don't know what it should be but if there is any reading (continuity) it's probably ok.

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All three tested good for continuity.
I left one connected to 12volts for five minutes. Thats a long time to watch and hold expecting a burnt thumb at any second. Nothing happened.

Ok, I was intrigued so I tested a couple. Both measured 3.9 Ω when cold. Then connected up to a 12V battery via a 3A fuse (blew instantly, good, we have current) then via a 5A which didn't blow (good again, that is as expected) and waited a few minutes to warm up. Measured with Infrared thermometer, and thumb. Both results confirmed it's bloody hot! Conclusion: there's something wrong with yours.

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Mocki wrote:Put power to it
+12vc to the fly lead and -12vdc to the bracket where the screw hole is , and it should get hot , don’t touch it hot!

24v?

tobydog wrote:

Mocki wrote:Put power to it
+12vc to the fly lead and -12vdc to the bracket where the screw hole is , and it should get hot , don’t touch it hot!

24v?

Nope! 12 volt. Its all 12 volt l tell ye!

ajsimmo wrote:Ok, I was intrigued so I tested a couple. Both measured 3.9 Ω when cold. Then connected up to a 12V battery via a 3A fuse (blew instantly, good, we have current) then via a 5A which didn't blow (good again, that is as expected) and waited a few minutes to warm up. Measured with Infrared thermometer, and thumb. Both results confirmed it's bloody hot! Conclusion: there's something wrong with yours.

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Thanks for the info Andrew. Will try two again, with a fuse this time.

This all came about when a forum user put an ad in Wanted for one. He got not results testing as above so assumed it was duff. I found two in loft and tested with 12v only to get same results. No heat!

Will test again just out of interest.
Thanks

Hi all,

I noticed one of these on my mates weber 34 dat...

I have the same carb...and don't have this.

I want one

How is it fitted to the pierburg?

How is it controlled? Same as manifold heater?

I'll post pics of his weber one.

Also.....
The holes in the manifold heater.... don't suppose the gasket is worth worrying about when there's vent holes in the bottom anyway??!