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Mk1 rack
Posted: Thu Apr 03, 2014 5:40 pm
by coop12g295
Rooting through my stash and found 3 racks is there any easy way to know which is for a mk1
knew I should have labelled them
Re: Mk1 rack
Posted: Thu Apr 03, 2014 7:32 pm
by swifty
Haven't got the answer for you but I'm glad you've bought the subject up as I need to know as well .
Re: Mk1 rack
Posted: Thu Apr 03, 2014 8:41 pm
by InimiaD
I thought MK 1 racks didn't have the plug for the centralizing / locator pin.
The other way to check is to measure the travel of the rack in each direction which should be 1.75 " in old money.
Re: Mk1 rack
Posted: Thu Apr 03, 2014 8:44 pm
by Andrew1967
Mk1 racks have smaller turning circle compared to a Mk2.
Cant remember the number of turns but think it might be something like 2.1 for Mk1 and 2.7 for Mk2 ?
Re: Mk1 rack
Posted: Fri Apr 04, 2014 12:53 am
by 'S'-type
I was pondering this question too. I have a few racks stored and didn't label them. A quick bit of research tells me that the Mark 1 rack had 15 teeth. I'm not sure how easy it is to count them without dismantling though. I also don't know if the mark 2 has more or less! My guess is more as the track rod ends on the mark 2 were closer to the hub and the rack has more travel.
When the mark 2 rack was introduced it had a plastic plug, on the opposite side to the pinion, which is removed to temporarily drop in a locator pin that locks the rack in the central position. When on the car this would be under the rubber grommet in the heel board. I don't know if this practice carried on in the later marks.
I haven't looked closely at my racks to see whether either of these identifying methods works! Maybe I'll have a look tomorrow.