GT40 Distributor issues
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=51476
Printed Date: November-22-2024 at 2:20am
Topic: GT40 Distributor issues
Posted By: wetskier2000
Subject: GT40 Distributor issues
Date Posted: February-22-2024 at 5:18pm
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I've replaced my 1997 SN GT40 distributor 3 times since new. OEM disty ran some 20 years before the Hall Effect sensor became wobbly and ceased to function. Stock, reman 351 unit replaced it from the local auto parts store. That ran 5+ years til the roll pin sheared. It was replaced last Sept with another parts store unit. The roll pin on that one just broke after 2-3 months of use. Would something else be causing these pins to break other than just crappy pins?? ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Replies:
Posted By: KENO
Date Posted: February-23-2024 at 8:26am
Sounds like a warm February vacation gone bad  You can read all kinds of stuff about Ford roll pins breaking for all kinds of different reasons. I imagine when you pulled things apart the gear and shaft might have been a loose fit. Normally the gear is a light press fit on that distributor and the roll pin helps to hold it in place with the press fit doing a lot of the work. Being a reman distributor, you never know what you had for a fit or if the gear was installed at the right height when it was assembled.. As a start I'd probably just get another distributor and install it or if you're feeling adventurous drive the roll pin out of the new one and verify that the gear won't slide off by hand and then if you're feeling more adventurous............drill out the gear and shaft for a 3/16 roll pin. The original is 1/8 inch X 3/4 long, so replace it with a 3/16X 3/4 long pin. Try not to think about things like oil pump problems causing the pin to break.  But....you could verify that the oil pump rotates with a primer tool or a 5/16 socket and a long extension Tape the socket to the extension so you don't lose it in the sump if you go the extension route.
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Posted By: wetskier2000
Date Posted: February-23-2024 at 12:41pm
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... not terribly bad, a quick trip to Ace Hardware and the boat is running again.. Of course, my wife got her slalom run in before it broke so all is well... The gear went back on without a press, but it was tight enough that I had to lightly tap it on the last inch or so... It's possible that it was a "light press fit" as you mentioned... I didn't try spinning the oil pump shaft by hand, but that does make sense. If that little gear is intended to drive a pump that spins easily and now it's not so easy, what's a little 1/8 roll pin gonna think... Got a feel for how hard or easy that pump should be to spin? Should just an extension twisted by hand do it? Or should a ratchet be needed? thanks, ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: KENO
Date Posted: February-23-2024 at 12:48pm
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Lightly tapping it the last inch or so is good, the lower part of the shaft is a smaller diameter that the area where the gear rides. I'd put a ratchet handle on the extension. If it's hard to turn, you'd know it right away. Tell yourself it was a bad roll pin, unless it happens again.
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Posted By: KENO
Date Posted: February-23-2024 at 2:30pm
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Since I had a partially assembled or disassembled engine in the garage, I figured I'd see how easy it was to turn the oil pump Turning the oil pump with a 1/4 inch drive socket set with a screwdriver type handle, an extension and a taped on 5/16 socket like in the picture below was easy. 
I let the Fram oil filter photobomb the picture because ...........well, just because
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Posted By: fanofccfan
Date Posted: February-23-2024 at 5:19pm
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Yikes Keno! A Fram filter sighting? A former member would not approve!! ------------- 2004 196 LE Ski 1969 Marauder 19 1978 Ski |
Posted By: wetskier2000
Date Posted: February-23-2024 at 10:46pm
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I think I'll use your "assume it was a bad pin" idea for now. Afterall, I am certainly not changing an oil pump here in FL and shudder at the idea even in my own garage... Once I'm back up north, I'll pull the disty and try to spin the pump then report back... ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: KENO
Date Posted: February-24-2024 at 8:25am
| I think your oil pump is just fine, but if you check it, that's how easy it turns |
Posted By: wetskier2000
Date Posted: February-24-2024 at 12:32pm
Thanks for all the help! Got in a few more runs this AM. So far so good. Head to Lake Norman on the 1st. I don't think the water will be quite as warm there.... ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |