355 F355 F1 issue solved!!!

Hello All,


I picked up a '98 F355 F1 Berlinetta last month in British Columbia from the second owner for a fair price due to the fact that it was experiencing some F1 system issues. I have solved the issues and want to share my findings with you just in case it helps someone out of a similar situation.

First off, this vehicle is running the Hill Engineering F360 F1 pump conversion kit that can be purchased through Ricambi America (part # PAB355F1-C). I know there is a bit of discussion about if these kits are good or not. It is what was on the vehicle when I purchased it so for the time being I'm going to be running this setup.

Initially I couldn't even drive the vehicle. The F1 system kept erroring out when trying to grab any gears including reverse. Upon first examination I found that the daisy-chain of fittings coming out of the F360 pump were leaking on the suction side of the system so the F1 fluid reservoir had run dry. I pulled the pump, resealed the fittings, filled and bled the F1 system (without the scanner - more on this later), and checked again for leaks. All good! At this point I'm able to go into all forward and reverse gears reliably and there are no external fluid leaks.

The next issue that I came across was that with the key on / engine off, the F1 pump would not stop cycling. It would prime, switch off, and prime again. This would continue as long as I had the key in the ON position. What I noticed was that there was an odd noise in between the run cycles of the F1 pump. It sounded like the pump was being forced in reverse. You can hear this in the video provided below. My theory at this point was that the high pressure side was pushing back to the low pressure side through the high pressure line due to a failed check valve somewhere in the system. I called Hill Engineering and spoke with Paul Hill about the kit. He informed me that his kit does have a check valve in it to prevent this from happening. After performing a few more tests I was able to confirm that the check valve had failed and a new one needed to be installed for the system to run correctly.





After a little bit of trial and error I was able to develop a kit that incorporates a check valve externally into the Hill Engineering kit. Once installed and leak checked I was able to confirm that this fixed the problem. The video below was taken after the vehicle was sitting for two days with the new check valve kit installed. I’m very happy to see that the time needed to bring the system up to pressure was so short after sitting for a while.





I took her for a drive and was very pleased with the result. I’m able to get into all gears reliably and the F1 system primes very quickly when I first get in for the day. As of right now, all leaks and shifting issues have been resolved. If anyone needs one of these kits, I can put one together fairly easily. PM me if you’re interested.

 

Adam, is the faulty old valve still in the system? I'm trying to envisage how a hydraulic valve could fail. Is there any possibility that the broken bits could enter the system?

 

I would imagine its a ball and spring type check valve, probably just not seating right which was allowing the leak down of pressure. could be miss manufactured, or just a tiny piece of dirt or contaminant?

 

I was thinking that, too. I was worried about bits of broken spring entering the system.

 

I checked the fluid when the system was flushed. Everything looked good (no glitter). The guys at Hill Engineering didn't mention anything about a catastrophic failure of the valve and spring within the head unit adapter as being a common failure.

I'm drawing the same conclusion as KennyD, it's most likely a seat issue or the spring has become weak. I was considering how Hill even fit a proper check valve into such a small enclosure. The check valve that I sourced is good to 5000 psi in the reverse direction with 5 psi brake pressure in the direction of flow.

 

Good catch on the check valve, and welcome to F1 ownership!

What you will find is that the F1 system tends to work fine, until it doesn't. About 10 years ago the wisdom was that it was pretty much a dealership issue needing a SD computer for every little issue. Today, the only task that really needs an SD computer is the actuator centering, we have found a way around most everything else. We have seen the pumps failing, and now it seems to be the accumulators that have started to age and fail (also and easy fix now), knowing how to diagnose and fix this system is a huge cost savings and cutting through the BS of what is actually going on.

Over the years I have tried to capture most of my F1 experience here: https://www.ferrarichat.com/forum/threads/f1-overhaul-thread-clutch-pump-throwout-flywheel-360-pump-etc.467896/

 

Adam! I'm glad you were able to sort this issue out. You are the right custodian for this car. I wish I had the time to work on it...I can't believe the Hill Engineering kit was the point of failure since it was essentially the newest component of the F1 system!

Enjoy it in good health!

 

Hi, I need help bleeding the f1 on my 1999 f355. We lost the gears in the process of changing the cv boot on the actuator where it links to the transmission shaft. I'm running the stock f1 pump. If you could help with the bleeding procedure it would be appreciated.

 

I don't have any solution for you but if you might need more info:

1) you disconnected the shift rod from its connection to the F1 actuator
2) you removed the bellow dust connector and replaced it
3) you re-attached the shift rod to the actuator

and now you need to bleed the F1 system even though there was no disconnection of any hydraulic line?

That does not seem to compute. Do you need to re-align the coupling of the rod to the actuator (that is something I also need to do and I am looking for solution too).

 

If youre around still, would you be willing to share the part numbers or put together one of these check valve kits you mentioned? Tia!