.875 master cylinder

[vince87ranger]

I cant find any help at any of the local auto stores for the .875 bore master cyl. each time their computers tell us that its .875 bore and when it gets here its really .75 bore.

does anyone have a direct part number for the .875 bore, or a known year and motor to tell the parts store guy?

 

[Mac]

Well, only option other than the master is the slave. Any idea of what it's bore is? I sure thought Teddyzee had found one that was a 7/8" bore MC.
Dave

 

[Teddyzee]

Yes, mine is from an '89 V6 Ranger. I just checked NAPA site, they no longer list the specs. But that site changes regularly...
Others claim to have measured these, and they are not 7/8". However, my clutch works with this master, and did not work with my stock 1997 5/8" bore master.

Who knows.

I found very very few slave cylinders less than 3/4" bore.

I think Willwood or other companies actually make an angle adapter for putting a straight slave in an angled use, like our Rangers.

My build may have a part number.

 

[Teddyzee]

I didn't measure it, but here is a comparison shot:

Here's the stock 5/8" master on the left, with the much larger 7/8" master from an '88-'91, non 4.0 truck. You can see it has an angled flange that bolts to the firewall. (firewall strength is an issue, that's why the design changed, I believe)

From this thread:
http://www.rangerpowersports.com/forum/f12/anyone-use-aftermarket-clutch-master-cyl-95-a-250266.html

 

[backerm]

well I've got an '88 and my master looks like the one on the right, but I have an internal slave. You might try LMC truck, they have some external slaves. That's strange, I can't remember ever seeing a ranger with an external slave.

 

[Teddyzee]

That's strange, I can't remember ever seeing a ranger with an external slave.

I believe only '83/'84 had them, three styles, one for each engine (6,4,diesel)

 

[vince87ranger]

well i've tried all the years and motor combniations including 4.0 that Teddyzee listed, and the auto stores list the MC as a .75, or .751 bore. now an old clutch shop in town pulled out a big dusty book and got a part number for a .875 bore MC from a 88-90 B2. but the part number is obsolete now and recommends the same .75 bore MC that i already have. so i don't know what i'm going to do as this is all i have left on my v8 m5od-r2 swap.

 

[backerm]

does the line fit in the master?

 

[baddad457]

The 7/8 bore may not be manufactured any longer for a 20 year old vehicle. When I went thru this ten years ago, I had to look thru the boxes at the local Advance Auto Parts to get what I wanted: a 7/8 bore aluminum master cylinder, the second time around I had to get them to order another and hope they got the right one, seems like they ordered twice at least before getting the 7/8 aluminum one.

 

[1988BroncoII]

i have a 88 ford bronco II with a m50d-r2 and a 93 cobra 5.0 i'm using the 88 factory Master Cylinder and the slave cylinder for a 88 bronco II fm146 and i have no issues with my clutch , i did at first when i bleed the clutch it still wouldn't fully disengage , after looking when i pressed the clutch all the way down the clutch pedel was hitting the firewall which wasn't allowing the mc to fully depress so i justg balled up some electrical tape threw it in the hole where the rod goes and all seems to work great after i rebleed the clutch the pedel isn't hitting the firewall anymore but my pedel is about 1/2 inch higher then my brake no biggie my clutch works great thanks to electrical tap.. hope this helps

 

[baddad457]

The firewall flexing with the mastercylinder will also cause disengagement issues. Mine did this until the firewall completely failed, my foot went litterally thru the floor. Made that joke more than a few times, but that was the first time it actually happened