jatco reverse clutch pressure tap

[debo]

could any body please tell me the location and thread size of the reverse clutch pressure tap so i can test the pressure to find out if my reverse piston is cracked without stripping it down thanks shaun

[SD1too]

Shaun; if you don't mind sending me a PM with an e-mail address, I will scan the page from the JF506E manual for you.

Who have you been speaking to? I've never heard of this being asked before. :D

Simon

[debo]

rrobson replyed in my other thread "Yes, you can test the reverse piston. You need a pressure tester. I have one but I'm not going to be home for a number of weeks so wouldn't be able to get it to you."
so i have made one up myself its just i dont know what size thread i need to screw into the gearbox and what pressures are required

[rrobson]

M10 metric fine

[debo]

nice one i will see if we have one in stock thanks

[SD1too]

PM received and document sent to your e-mail address Shaun. :}

Simon

[debo]

thanks mate i have also done what you asked in the email :}

[debo]

Hi I have just done a pressure test on my gearbox useing the reverse clutch tap and got 0psi in drive closed throttle, 0psi in drive at stall and 100psi in reverse closed throttle please could anybody tell me if this is ok or is it any signs of failure any help would be much appreciated thanks debo

[SD1too]

Hi Shaun,

Well, the extract from the manual which I sent you says:

"Use the reverse clutch tap when testing in the 'R' range position"

So I take that to mean that you can ignore the test results you obtained in Drive.

The pressures given for 'R' range are 80 - 109 psi at idle. You got 100 psi with the throttle closed which is the same as idle, so I'd say that your gearbox is within the specification for the reverse clutch.

Simon

[andrewinpopayan]

How many tapping points are there on these boxes? I used to work on Leyland buses and there were 3 tapping points and a 3 gauge test set.

[SD1too]

How many tapping points are there on these boxes?
As far as I can tell from the manual Andrew, there appear to be five.

Simon

[rrobson]

Only two on our cars, and the other transaxle variants. However all the ports are on both varients

[debo]

What is the other tap used to test on these gearboxes thanks

[SD1too]

Only two on our cars, and the other transaxle variants. However all the ports are on both varients
OK Reece, thanks for that. I understand when you say that there are only two on the MGR version of the gearbox, and I would also like to know which two.

But what do you mean by "all the ports are on both variants"? You've just said that we have only two. :confused: :shrug:

Simon

[rrobson]

Sorry, I didn't mean to be confusing.

Acording to the manual, there are only two ports which can be used on the transaxle varient. The one on the side for the reverse piston and one on the top for all forward speeds.

But for some reason on the other varients, you use about 4 or 5 ports.

What I meant is on the gearbox there are at least 10 plugs, no matter what car it's in, but you only use two on our cars.