351C Oil Pump - Melling M84-A
Printed From: The Ford Torino Page
Category: Powertrain Specific Forum
Forum Name: 335 Series Engine Forum
Forum Description: 351C, 351M and 400 engines
URL: https://forum.grantorinosport.org/forum_posts.asp?TID=19204
Printed Date: 17-April-2024 at 1:40PM
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com
Topic: 351C Oil Pump - Melling M84-A
Posted By: texanrebel
Subject: 351C Oil Pump - Melling M84-A
Date Posted: 02-November-2020 at 1:52AM
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Is there a way to remove the welsh cap/plug to enable access to the relief spring to install a shim? Removed the pin...and I don't see anyway of removing it without damage & replacing. ------------- 1972 Montego GT 1977 Mercury Monarch 1988 Ford Thunderbird Turbo Coupe |
Replies:
Posted By: Rockatansky
Date Posted: 02-November-2020 at 10:49AM
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the usual suggestion is to run a self tapping screw into the plug and work it out however you can. yes the pug will need to be repaired with weld to close the hole or replaced. they say the plug is reverse taper and can be hard to source replacements. IIRC i think i've seen people post that they've used a regular taper plug. some just push the original plug in farther and shim up to 1/8" max, and some say it makes no difference after the engine warms up the pressure will be about the same. makes sense because the spring controls a safety blow-off valve, not a regulator in the traditional sense. once the oil reached temp and thins out, the valve usually doesn't open again because the viscosity has thinned out. here's a thread from the old forum, use the search there to find many more. oiling is a big topic https://www.tapatalk.com/groups/clevelands/viewtopic.php?p=15290#p15290" rel="nofollow - https://www.tapatalk.com/groups/clevelands/viewtopic.php?p=15290#p15290 i know for sure the size & part number for a reverse plug is in that old forum somewhere ------------- 72 GT Ute |
Posted By: Rockatansky
Date Posted: 02-November-2020 at 11:58AM
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plug gets destroyed http://www.tapatalk.com/groups/clevelands/viewtopic.php?p=152445#p152445" rel="nofollow - https://www.tapatalk.com/groups/clevelands/viewtopic.php?p=152445#p152445 Super Roo gives the size ... but verify it yourself! http://www.tapatalk.com/groups/clevelands/viewtopic.php?p=21352#p21352" rel="nofollow - https://www.tapatalk.com/groups/clevelands/viewtopic.php?p=21352#p21352 listings for std taper plugs, concave or flat bottom http://www.boltproducts.com/expansion-plugs.html" rel="nofollow - https://www.boltproducts.com/expansion-plugs.html this might be it? but verify yourself! http://www.summitracing.com/parts/mel-mpc-156" rel="nofollow - https://www.summitracing.com/parts/mel-mpc-156 ------------- 72 GT Ute |
Posted By: texanrebel
Date Posted: 02-November-2020 at 2:26PM
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Thanks Rock, I did a quick check on Tap Talk but had to go offline so didn't get much of a chance to look around. I figured it would be the drill hole & install screw route. Once again, thanks for the info. Billy ------------- 1972 Montego GT 1977 Mercury Monarch 1988 Ford Thunderbird Turbo Coupe |
Posted By: texanrebel
Date Posted: 04-November-2020 at 10:55PM
The Melling plug MEL-MPC-156 is a perfect fit. Just have to get something a little more robust to insert in the pin hole to secure. In the link the guy suggested a piece of solid fence wire. ------------- 1972 Montego GT 1977 Mercury Monarch 1988 Ford Thunderbird Turbo Coupe |
Posted By: texanrebel
Date Posted: 04-November-2020 at 10:57PM
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To clarify...meaning the pin hole in the pump housing. I placed the old plug (with hole I drilled to extract) next to the new one for comparison. ------------- 1972 Montego GT 1977 Mercury Monarch 1988 Ford Thunderbird Turbo Coupe |
Posted By: Rockatansky
Date Posted: 05-November-2020 at 4:25PM
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sounds a little redneck to me? i've also heard of drilling the hole larger to fit a roll pin but thinking about it engine vibration & harmonics could cause any type of pin that's not mechanically trapped to walk out. never heard of the standard cotter pin failing either though
------------- 72 GT Ute |
Posted By: texanrebel
Date Posted: 06-November-2020 at 1:10AM
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Agree, I just kept the original cotter pin ------------- 1972 Montego GT 1977 Mercury Monarch 1988 Ford Thunderbird Turbo Coupe |