Lmackattack Posted July 11 Share Posted July 11 My injection pump has a leak at one of the barrels where it threads in. I recall someone saying you can remove the line, unthread the barrel and a oring is in there? Is it that simple? This is on my 1977 285 maxidyne Quote Link to comment https://www.bigmacktrucks.com/topic/74338-injection-pump-leaking-at-the-top/ Share on other sites More sharing options...
fjh Posted July 12 Share Posted July 12 2 hours ago, Lmackattack said: My injection pump has a leak at one of the barrels where it threads in. I recall someone saying you can remove the line, unthread the barrel and a oring is in there? Is it that simple? This is on my 1977 285 maxidyne Is it Ambac? Quote Link to comment https://www.bigmacktrucks.com/topic/74338-injection-pump-leaking-at-the-top/#findComment-555057 Share on other sites More sharing options...
Lmackattack Posted July 12 Author Share Posted July 12 45 minutes ago, fjh said: Is it Ambac? Yes sir. Quote Link to comment https://www.bigmacktrucks.com/topic/74338-injection-pump-leaking-at-the-top/#findComment-555059 Share on other sites More sharing options...
fjh Posted July 12 Share Posted July 12 Nope it’s metal on metal ! You could try putting a 11/4 wrench to it and try tightening abit! The top and bottom are two lapped peices! The oring is ment to seal out dirt! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74338-injection-pump-leaking-at-the-top/#findComment-555062 Share on other sites More sharing options...
Lmackattack Posted July 12 Author Share Posted July 12 1 minute ago, fjh said: Nope it’s metal on metal ! You could try putting a 11/4 wrench to it and try tightening abit! The top and bottom are two lapped peices! Oh man.... and can you repair it in the truck or does the pump need to be pulled out? Quote Link to comment https://www.bigmacktrucks.com/topic/74338-injection-pump-leaking-at-the-top/#findComment-555063 Share on other sites More sharing options...
fjh Posted July 12 Share Posted July 12 Do you have a diesel repair shop in your area? If so you could have the top piece lapped as a patch up! Try snuging it first! Quote Link to comment https://www.bigmacktrucks.com/topic/74338-injection-pump-leaking-at-the-top/#findComment-555068 Share on other sites More sharing options...
Ggrab004 Posted July 13 Share Posted July 13 I had a similar problem. I pulled the injector and used diamond paste and a mirror to lap the metal sealing surface. It took a while, but as soon as I got that pitting out, it stopped the leak. Very slow process! 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74338-injection-pump-leaking-at-the-top/#findComment-555140 Share on other sites More sharing options...
fjh Posted July 14 Share Posted July 14 3 hours ago, Ggrab004 said: I had a similar problem. I pulled the injector and used diamond paste and a mirror to lap the metal sealing surface. It took a while, but as soon as I got that pitting out, it stopped the leak. Very slow process! Worth a try I suppose! What did you use to turn the top section?You would have to be careful to clean out all contaminants! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74338-injection-pump-leaking-at-the-top/#findComment-555159 Share on other sites More sharing options...
Ggrab004 Posted July 14 Share Posted July 14 1 hour ago, fjh said: Worth a try I suppose! What did you use to turn the top section?You would have to be careful to clean out all contaminants! I'm not sure what you mean by top section, but I used a flare nut wrench to take the injector line off, then a socket with a breaker bar to remove the injector seat from the injector pump. I did clean the top of the pump several times while diagnosing exactly where the leak was coming from. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74338-injection-pump-leaking-at-the-top/#findComment-555165 Share on other sites More sharing options...
mechohaulic Posted July 14 Share Posted July 14 by "top section" the reference would be to the 1 1/4 nut barrel hold-down. during that procedure requires , cleanliness higher then the standards used in open heart surgery. just the dirt inside the socket can fall in and contaminate things. once removed the barrel hold down has a 3/32nd (?) -less then 1/8=more then 1/16 square o-ring on top. works only as dirt seal. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74338-injection-pump-leaking-at-the-top/#findComment-555168 Share on other sites More sharing options...
fjh Posted July 14 Share Posted July 14 26 minutes ago, mechohaulic said: by "top section" the reference would be to the 1 1/4 nut barrel hold-down. during that procedure requires , cleanliness higher then the standards used in open heart surgery. just the dirt inside the socket can fall in and contaminate things. once removed the barrel hold down has a 3/32nd (?) -less then 1/8=more then 1/16 square o-ring on top. works only as dirt seal. Yup extreme cleaning while doing anything around the pump!you can upset the apple cart real quick! 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74338-injection-pump-leaking-at-the-top/#findComment-555172 Share on other sites More sharing options...
JoeH Posted July 14 Share Posted July 14 Did you try just tightening the nut? Quote Link to comment https://www.bigmacktrucks.com/topic/74338-injection-pump-leaking-at-the-top/#findComment-555200 Share on other sites More sharing options...
Lmackattack Posted July 16 Author Share Posted July 16 On 7/14/2024 at 1:25 PM, JoeH said: Did you try just tightening the nut? Not yet. Been busy. I will report back soon 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74338-injection-pump-leaking-at-the-top/#findComment-555311 Share on other sites More sharing options...
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