1170 thd gear problem update

Ron Sa · Jan 18, 2022

This is a follow up on my post in early Dec regarding my 1170 slipping out of 3rd with a bang. I am finally making time to attempt to remove the tranny's top plate so I can inspect the damage better than just look thru the little inspection hole. This small opening only allows me to see clearly mainly the upper portion of the shift levers.

All nine of the half inch cover retainer bolts presented no problem to loosen.

Number 11 is a dowel bolt. It is turning very hard to loosen. I immediately wondered if this soft? dowel bolt might gall up. I turned it about a half turn and decided to stop. A haft turn loose should allow penetrating oil to get below the bolt head and hopefully penetrate some into the dowel's tight fit. I plan let it soak for a couple of days.

Anyone had a problem with this dowl bolt being tight enough to cease up?

chuck machinist · Jan 19, 2022

Morning Ron,

I woke this morning thinking of how you were progressing. You were wise on soaking the dowel bolt. I suspect moisture has worked in on her. Bees wax and a propane torch would be plan B for her. Situation awareness with the propane torch though.CM

Ron Sa · Jan 22, 2022

Chuck,
After soaking the dowel bolt for 3 days with penetrating oil, it still turned hard but I decided it was NOW OR NEVER!!! It filially started to loosen up and came out with no problem. Big relief!!

My next snag is a minor problem. See picture. For some reason, one of the bolts has a 12p socket head such as is normally used in recessed holes but its hole is not recessed. Defined in the parts book as a 1/2 NC, I did not see it as a problem thinking the socket size is the same as the bolt diameter for this style bolt. WRONG for this bolt 1/2 socket is too small 9/16 is too big

I do not have any 17/32 sockets in my stash so will have to wait till midweek for ones to arrive off the internet. Stuff happens.

mEl · Jan 23, 2022

(reply to post at 19:31:29 01/22/22)

Ron, I have never encountered that with that bolt, I wonder if it may be partially rounded, I have done literally dozens of those over my years with Case and have never owned a 17/32, I wonder also maybe someone put a wrong bolt in it, what keeps you from putting a standard headed bolt in its place, would that interfere with the small cover?

chuck machinist · Jan 26, 2022

The 12 point offers the ability to apply more torque, which eliminates rounding of the head of the standard hex head. CM

mEl · Jan 27, 2022

I believe the issue here is that there is a small access plate that curves around 3/4 of the base of the head of the bolt and a standard bolt would interfere with the cover, Torque is not a issue here as all would be torqued to 1/2 inch bolt spec, it is a matter of clearance, if one wanted to make a spacer to raise the head of the bolt above the plate a standard bolt could be used, a booger head like myself might just put an extra lock washer on and use a standard bolt.

This post was edited by mEl on 01/27/2022 at 05:10 am.

Ron Sa · Jan 27, 2022

Thanks guys for your inputs. I GOT SNOOKERED BY THIS BOLT!! Not a first. LOL

The odd ball 17/32 socket arrived yesterday. It engaged LOOSELY on the head of the bolt so I tugged on the wrench carefully. Fortunately this bolt was only half tight, like the other bolts holding the cover in place, so it came loose before rounding corners. It was like the socket needed to be 1/64 less i.e. 33/64.

Old age is a bummer when trying to figure things out. Early on, I had noticed Ferry cap (below) was included in the bolt description but I did not understand what it meant.

I glossed over what it might mean until finding my 1/2 socket was too small, the 9/16 was too big, and later finding the in between size 17/32 was a tad big.

It was an inch-size bolt so I never consider a metric head size. It dawned on me that bolts are sometimes referred to as cap screws. I Googled Ferry cap screw and up came a bolt company in INDIA. Foreign companies tend to be metric so it finally dawned on me to try my metric sockets on this inch-size bolt. Sure enough, a 13mm socket fits perfectly. sigh!!

mEl · Jan 27, 2022

Interesting, oh well all is well that ends well they say. I must say I've never ran into that myself.

1170 thd gear problem update

Ron Sa

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chuck machinist

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Ron Sa

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mEl

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chuck machinist

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mEl

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Ron Sa

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mEl

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