New membranes available for the warm up regulator and fuel distributor 400i and 412

Excellent stuff!

When I'm in Den Haag I will give you a visit, nice parts you have.

 

Impressive!

Al

 

Do you know whether the membrane material is compatible with the ethanol with which we are blessed in the US?
Greg

 

Hi Geert, Are these membranes still available? I see the original post was 12 years ago!!

 

It seems Geert's "Ferrari 400 Parts"no longer operates. (?) http://www.ferrari400parts.com/

There were discussions on a German Mercedes forum where members had used membranes supplied by him.
Many seems to recommend TS Technik instead for membranes and other K-Jetronic parts: https://www.tstechnik-shop.de/

Similarly the same members recommends this article for advice on the procedure, in German though..: https://www.hanshehl.de/tipp98-24-1.htm

I myself have no experience of using the parts from either supplier, good luck!

 

Yes, they are readily available.

 

Thanks for the reply. Have found them on eBay through the same TS Technik company so will contact them. My car has been sitting in a 'collection' for a long time so needs a full system refurbishment.

 

Is this the rebuild kit we need?
https://www.tstechnik-shop.de/warmlaufregler-reparaturs%C3%A4tze/mit-vakuum/einzelmembran-wlr-2/#cc-m-product-7708846911

 

This is the rebuild kit for the warm up regulator (with vacuum) quoted in post #1. Bosch part no. 0 438 140 033

Rebuild kit for ONE fuel distributor: https://www.tstechnik-shop.de/shop/aluminium-5-6-zylinder/ts-106-02-02-f/#cc-m-product-7768683311

 

I've installed savox products. I had to punch one of the holes, but the kit does the job. It is also cheaper and certified as "ethanol compliant".

 

Assuming one gets the kit and does the install, what other "calibration" is needed before reinstallation and perfect operation?

 

The experience of this Mercedes owner is quite good, even after Google Translate: https://www.hanshehl.de/tipp98-24-1.htm
This also details how to check the fuel pressure, which is of course very important,

Good opportunity to check spark plugs, compression, plug lead resistance, check adjust mixture of course ( adjust CO, check HC levels)
Unless it has been done earlier it's a good time to replace fuel filters too, Injector nozzles can clog up too and not create the proper spray pattern.
An "unclean" spray pattern result in difficulty starting when warm with black smoke and rich idle mixture with high CO and HC levels.

Injectors can be checked in a rudimentary way while connected to the system but the ideal is to to go to someone with a test rig. (video here)
They can be cleaned in a ultrasound cleaner I suppose, the alternative is to replace them with new injectors.

The non return valve can cause problems too, also makes the car difficult/impossible to start until the cold start regulator kicks in again
and gets the system running (bled) again. Fuel bleeds back into the tank and creates air pockets which then prevents the injectors to open.

I assume you can get rebuild kits for the non-return valves for the Ferraris fitted with K-Jetronic like with all other cars with the system.

Here's a company in the US who supplies rebuild kits and other parts for Bosch K-Jetronic:
https://cis-jetronic.com/index.php?rt=product/product&manufacturer_id=26&product_id=237

 

If it works before disasembly, just replace the seals, adjust warmup cold and hot pressure, adjust CO, but don't mess with the injectors individual adjudtments.

One day to replace all the seals, one day to tune.

It won't be perfect but it is easy to get the setting in the ballpark.

At the end of the tuning, check the exhaust temps with a laser gun: if both banks are not the same temp, you've got a problem.

 

While you are at it, measure the flow at each injector before you put it back together, you will probably find that you can balance them far better than what was done at the factory.

They are very easy to adjust, don't believe the widely spread myth that is it difficult to do or that you need specialized equipment - look at my thread.

 

If you know how to refurbish a set of weber, the k-jet is not any worse. It's even easier than carbs as you only have two units.