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HEI installation problem
#1373615 Sun Aug 16 2020 04:57 PM
Joined: Aug 2017
Posts: 33
T
tfisher Offline OP
Wrench Fetcher
I am attempting to install a Langdon HEI in a 1954 235. After dropping the unit into the block, I notice a 1/4 inch gap between the shoulder of the dist shaft and the block. I am sure I am engaged in the oil pump drive. I am worried that when I tighten the clamp I will be binding the shaft in the block. Anyone else have this problem?
Also, the o-ring sits in the notched groove in the block, but nothing is holding it down. I don't want to proceed if something is wrong.

Re: HEI installation problem
tfisher #1373619 Sun Aug 16 2020 05:45 PM
Joined: Jul 2000
Posts: 1,062
G
Shop Clutterist
I don't have the Langdon HEI, but can you measure the length of the shaft and compare it to the original distributor? If it's too long, you should send it back.


Gord
----
1954 1/2 ton 235 4 speed
Re: HEI installation problem
tfisher #1373622 Sun Aug 16 2020 06:14 PM
Joined: Aug 2017
Posts: 33
T
tfisher Offline OP
Wrench Fetcher
The hei is about 1/8 inch longer than the old dis, measured from the shoulder of the dist to the bottom of the drive gear. The main difference is old dist floats in the block. The retaining bolt just keeps it from rotating. The clamp and bolt on the hei unit actually pushes the dist down into the block which I believe will bind the shaft.

Re: HEI installation problem
tfisher #1373623 Sun Aug 16 2020 06:16 PM
Joined: Mar 2014
Posts: 1,709
J
Shop Shark
The one I have fit just fine. Please be certain you have the oil pump drive engaged. Hate to ask this but you do know the shaft turns as you install it, yes? So the slot and the tab can look like they will align, but by the time that the pump is inserted it will have rotated. The o-ring? I recall a thin rubber washer but not an o-ring. Is this what you mean?


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: HEI installation problem
tfisher #1373624 Sun Aug 16 2020 06:30 PM
Joined: Mar 2014
Posts: 1,709
J
Shop Shark
Found a note I'd written to myself about that measurement...try 4 7/8" from bottom of dist. mounting flange to tip of the oil pump tab. See if that's close or if that number was for something else.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: HEI installation problem
Jon G #1373633 Sun Aug 16 2020 07:54 PM
Joined: Aug 2017
Posts: 33
T
tfisher Offline OP
Wrench Fetcher
I am sure I am in the slot. The shaft rotates 5 to 10 degrees C.C.. If I'm not in the slot the gap is about 1/2 inch.
I also measure 4 7/8", but it is not the tip that is hitting. The bottom of my dist drive gear, (which is 3 1/4" from the dist base) is hitting the machined flange down in the block,(which is only 3" deep). This is the reason for the 1/4" gap. This might be ok if the dist floated, but the bolt and clamp from the hei push the dist down in the block and I would think cause it to bind.

Re: HEI installation problem
tfisher #1373636 Sun Aug 16 2020 08:14 PM
Joined: Mar 2014
Posts: 1,709
J
Shop Shark
It will bind. I was going to ask if the driven gear is mounted correctly, but that's a wasted question. If it was upside down, I think it would make a difference of about 1 inch. I just stepped out and measured a block which is here and 3 inches to that flange is correct. Have you measured from the bottom of the gear to the mounting flange? Can you let us know what that measurement is?


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: HEI installation problem
tfisher #1373637 Sun Aug 16 2020 08:17 PM
Joined: Mar 2014
Posts: 1,709
J
Shop Shark
Also, the measurement from the bottom of the gear (the toothed part) to the tip of the oil pump tab should be 2 1/8".


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: HEI installation problem
tfisher #1373638 Sun Aug 16 2020 08:25 PM
Joined: Mar 2014
Posts: 1,709
J
Shop Shark
Here are a couple of measurements from a stock distributor which may help. From the tip of the oil pump tab to the lower toothed surface of the driven gear is 1 11/16" and the stock gear is 1 1/16 wide (in total).

Attached Files
MVC-274F.JPG (26.4 KB, 96 downloads)

Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: HEI installation problem
tfisher #1373643 Sun Aug 16 2020 08:39 PM
Joined: Aug 2017
Posts: 33
T
tfisher Offline OP
Wrench Fetcher
I am 2 1/8" there also, but my problem is not with the tip. I am 1/4" too long from the bottom of the gear shoulder(not the teeth) and the bottom of the mounting base.

How about this?
Might there be a difference between a 1954 235 out of a car and a 1954 235 out of a truck?

I don't remember specifing when I ordered.

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