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Tool Talk Discussion Forum

Re: 7.3L Diesel Rear Main Seal

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rusted nuts

03-23-2013 15:23:27

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How many miles? Could be the mains bearings if it has hight miles. Could be the vent. Are you useing synthetic oil? I put synthetic in a perkings one time, Rear seal started leaking replace seal with a new one, Stilled leaked, Sold the rig that the engine was on and never thought about the synthetic oil causeing it till after I sold it. Thing was it never leaked out the rear seal til I put the synthetic oil in it. Was a rebuilt engine to boot only had bout 500 hrs on it.

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03-23-2013 16:35:37

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 Re: 7.3L Diesel Rear Main Seal in reply to rusted nuts, 03-23-2013 15:23:27  
it's not the syn oil making the seal leak.

my 99 f450 has 130k on it. it had amsoil in it 100% of the time till about 2010 then i switched it to valvoline premim blue syn.

100% dry.. never has ever put a drip on the concrete.

my 99 f350 had 'whatever' oil in it till about 2011 then now has that same valvolene blue syn oil in it. engine does not leak.. trans drips a couple drops a week.. nothing I'm bothered about. that truck is about 191K

it's NOT the oil..

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rusted nuts

03-23-2013 16:41:00

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 Re: 7.3L Diesel Rear Main Seal in reply to soundguy, 03-23-2013 16:35:37  
Glad it worked for you. Myself I"ll never ever look at the chit again, Besides Soundguy, Just cause You say "It"s not the oil" Don"t mean it wasn"t.

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03-23-2013 16:58:03

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 Re: 7.3L Diesel Rear Main Seal in reply to rusted nuts, 03-23-2013 16:41:00  
and because you say it is doesn't mean it is.

at least I have 2 examples to look at.. one with syn oil in it it's entire life... that 450 has had syn oil since the day after it rolled out of the factory after the stuff it came with was drained out.

too many people blame and attribute absurd things to situations without sufficient evidence to carry the argument.

Back in the middle ages they thought tomatoes were poison and that frogs were born out of mud and flies came from rotting meat. they say some limited but incomplete cause and effect and missed a few important issues inthe middle before drawing a conclusion. Oh yeah.. earth ain't flat either.. not anymore... :)

I'd think a new engine.. or a rebuilt engine would be a good candidate for a syn switch.. vs an aged one.

no way to post diagnose your rig now.. but i'd blame the rear seal or the install or the retainer or the sealing surface before I'd balme the oil.

I've seen many replaced mains on tractors only to see an annoying drip... oil would be on the last of a list for what I would think the cause was attributed to.

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rusted nuts

03-23-2013 17:38:41

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 Re: 7.3L Diesel Rear Main Seal in reply to soundguy, 03-23-2013 16:58:03  
Whatever. Was only trying to help the guy, not get into a pissing match with you. good night.

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03-23-2013 17:56:07

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 Re: 7.3L Diesel Rear Main Seal in reply to rusted nuts, 03-23-2013 17:38:41  
no pee'ing match.. you posted an observation.. I posted an observation.. If you did want any other possible opinions posted.. you could have said so in your post.

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Rusted nuts

03-23-2013 18:04:47

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 Re: 7.3L Diesel Rear Main Seal in reply to soundguy, 03-23-2013 17:56:07  
Well since we"ll not peeing round bout it, I"m going to bed.

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