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If the cowl vent on a 51 works like my 56, it wants to hang up on a return flange at the bottom of the cowl vent when trying to pull it out the top of the opening. I just pushed it one way (left), pulled it up past the cowl opening, then slid it out in that direction. My cowl vent hangs up left-to-right, but not fore-to-aft.
Clear as mud? Basically, it just took some yanking and pulling. Heck, they got it in there...
On your handle in the cab there's a nut with a spring and washer setup. Remove the nut( it's in a vertical position on one side ) and carefully take the pieces apart. This will give you more swing on the lever to allow you to remove it.
Ah, I started removing that spring loaded assembley, but stopped, thinking I wouldn;t gain anything but a migrane headache when it comes time for re-assembly.
I'll give it a try tonight. 14 days straight of working on thhis thing, I needed a break.
I was starting to thing they built the cab around this vent.
Draw sketches of how it all looks assembled before you start.
I don't have any new info for you, but do have this story.......
My 48 came with no linkage on the cowl vent - just the lid screwed to the cowl. Silly me wondered why someone would do that? Found one like new in a local junk yard - asked how much for the cowl vent and the operator asked "Who's going to take it out, me or you?" Should have told me something right there...... $10 and blood leaking from several places I had my new cowl vent. Then I got it home and tried to install it........Finally got it in place - and every time it rains or I wash the truck I think about screwing it shut..... except I love the way it scoops air into the cab on dry summer days. Its a love/hate relationship thing.
I've taken a couple of these out now and they are a pain in the **** but they do come out eventually. Just play with it some and you will find a way. I remember disassembling the spring loaded screw but later realizing that I did not really need to.
I have done it both ways, without some disassembly and and after removing the nut and spring. It just takes the right combination of cocking and turning. It goes in easier I find than it comes out-not at all logical.