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Old 05-02-2021, 10:48 PM   #1
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Gulf oil filter problem

I have an accepted offer in on a boat with John Deere 6068sfm. 1200 hours , 15 years old. All ok except high lead. No high copper, nor high anything else. The party line is that the gulf coast filter cylinder was not cleaned properly so created high ppm. Does that make sense? Thanks.
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Old 05-02-2021, 11:11 PM   #2
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There really isnít much to clean in one, just replace the filter element, maybe a roll of paper towels, and that is about all you do to them as I understand it. Maybe PM Ski and ask, he is very knowledgeable about engines.
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Old 05-03-2021, 12:08 AM   #3
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Lead is from main, rod and cam bearings. If too much bearing surface has worn away, you have low oil pressure. If the oil pressure is normal once the engine is at full operating temperature, you're probably ok.

Properly used, A Gulf Coast Filter should keep the oil exceptionally clean.
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Old 05-03-2021, 12:46 AM   #4
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Thanks Comodave. Yes, I was hoping Ski would have a chance to comment. Have been quietly reading forum for years and his is always the voice of reason.
Thanks for your thoughts Lepke too. I know you have a ton of experience and totally respect your opinion. I have seen various pressures for a warm engine at idle so I am still in doubt of correct pressure. My understanding is 13-15 psi at idle is correct but that seems low.
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Old 05-03-2021, 03:56 AM   #5
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... My understanding is 13-15 psi at idle is correct but that seems low.
Yes it is very low unless there is something special about that engine model. Ski will know. Red flags waving!
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Old 05-03-2021, 05:16 AM   #6
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Maybe contact JD for oil contaminant tell tales to look for. But -----

I am not a fan of gulf coast oil filters. Especially if used in place of the OEM setup. Why not? The after market canister designs I've seen seem too low tech and subject to paper degradation Vs a JD pleated element setup. On fuel the debate is different if a JD on engine secondary is in place.

Any evidence or records that indicate annual oil changes? If not suspect dirty oil as a culprit for high lead. If you otherwise like the boat get an estimate for an in frame rebuild and negotiate accordingly. And go to a standard JD oil filter setup.
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Old 05-03-2021, 07:50 AM   #7
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Can you tell us the lead number? Or better yet post the report?
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Old 05-03-2021, 07:54 AM   #8
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I won't be too much help on this one. I don't have experience with the GC filters, and not much with the 6068. Don't know if 13-15psi at hot idle is low. That is pretty typical for lots of similar engines.

Lead is often in the alloy used as an overlay on bearing surfaces. So if that overlay is worn, there will be Pb and also the other metals used in the alloy. The blend of metals used in the alloy varies with the bearing shell mfr.

Good start is to post up the whole oil analysis. Might be able to pick through the numbers a bit.
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Old 05-03-2021, 09:46 AM   #9
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Originally Posted by Riff Raff View Post
Thanks Comodave. Yes, I was hoping Ski would have a chance to comment. Have been quietly reading forum for years and his is always the voice of reason.
Thanks for your thoughts Lepke too. I know you have a ton of experience and totally respect your opinion. I have seen various pressures for a warm engine at idle so I am still in doubt of correct pressure. My understanding is 13-15 psi at idle is correct but that seems low.

According to the manual, 15PSI at slow idle is correct. That said, I doubt the Gulf Coast filter is at fault and high lead is a scary metal to have in the oil.


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Old 05-03-2021, 03:43 PM   #10
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Lead amount

The ppm for the lead is 51 ppm. All other components of sample completely normal. Not high at all. Will try to post sample results. I am fairly sure the oil has not been changed for years nor the oem filters. Date on gulf coast filter change was November 2020. No date on oem filters and PO said no need to change oil and he directed me to gulf coast website to see why oil didnít need to be changed , just their filter. . Of course that was before poor sample results.
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Old 05-03-2021, 04:00 PM   #11
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oil sample

1428688_4JDXM068069#ALCHEMY_ENG_MAIN_H430-51110-3005_AR.PDF

hope this is legible. first attempt.
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Old 05-03-2021, 05:38 PM   #12
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Labs have been known to make mistakes. I would send a second sample to either the same lab or a different one.

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Old 05-03-2021, 05:44 PM   #13
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Quote:
Originally Posted by sunchaser View Post
Maybe contact JD for oil contaminant tell tales to look for. But -----

I am not a fan of gulf coast oil filters. Especially if used in place of the OEM setup. Why not? The after market canister designs I've seen seem too low tech and subject to paper degradation Vs a JD pleated element setup. On fuel the debate is different if a JD on engine secondary is in place.

Any evidence or records that indicate annual oil changes? If not suspect dirty oil as a culprit for high lead. If you otherwise like the boat get an estimate for an in frame rebuild and negotiate accordingly. And go to a standard JD oil filter setup.
You donít use a GC BYPASS filter as the only filter. The majority of the oil still flows through the OEM filter and a bit goes through the bypass filter for ultra filtration.
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Old 05-03-2021, 05:48 PM   #14
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The ppm for the lead is 51 ppm. All other components of sample completely normal. Not high at all. Will try to post sample results. I am fairly sure the oil has not been changed for years nor the oem filters. Date on gulf coast filter change was November 2020. No date on oem filters and PO said no need to change oil and he directed me to gulf coast website to see why oil didnít need to be changed , just their filter. . Of course that was before poor sample results.
Yes, if you filter the oil to an extreme level then it doesnít need to be changed, maybe ever, but the additives in the oil do get depleted. Donít know if you can add some additives back in or not. But each time you change the paper element in the GC filter you have to add about a gallon of new oil so that MAY replenish the additives. GC has a test kit for the oil, not sure how it works. I was going to put GC filters on a previous boat but found that I didnít have enough room as the GC filters are really big.
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Old 05-04-2021, 07:24 AM   #15
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Originally Posted by Riff Raff View Post
The ppm for the lead is 51 ppm. All other components of sample completely normal. Not high at all. Will try to post sample results. I am fairly sure the oil has not been changed for years nor the oem filters. Date on gulf coast filter change was November 2020. No date on oem filters and PO said no need to change oil and he directed me to gulf coast website to see why oil didnít need to be changed , just their filter. . Of course that was before poor sample results.
The highest lead content I ever had on my Lehman analysis was 1 ppm.
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Old 05-04-2021, 08:34 AM   #16
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Iím confused. The Gulf Coast filter is for oil, or for fuel? I thought they were for fuel.

The engine is low hours and a good engine, but sounds like the oil was never changed. You could change the oil and probably run the engine for 20,000 hrs. But there is some risk of actual damage, so really depends on you risk appetite.

Regardless, if the GC is oil filtration, and worse yet has eliminated the on engine oil filter, I would lose it immediately and restore to factory configuration. An oil change every 250hrs is cheap insurance and a good excuse to give the engine a closer look.
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Old 05-04-2021, 09:18 PM   #17
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i would appreciate any knowledgeable comments on all the metal levels of sample. Thanks, Jeff
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Old 05-04-2021, 10:21 PM   #18
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I’m confused. The Gulf Coast filter is for oil, or for fuel? I thought they were for fuel.

The engine is low hours and a good engine, but sounds like the oil was never changed. You could change the oil and probably run the engine for 20,000 hrs. But there is some risk of actual damage, so really depends on you risk appetite.

Regardless, if the GC is oil filtration, and worse yet has eliminated the on engine oil filter, I would lose it immediately and restore to factory configuration. An oil change every 250hrs is cheap insurance and a good excuse to give the engine a closer look.
No, as I said above the GC is a BYPASS filter. See post #13. It does not replace the OEM oil filter. You take a small amount of the oil filter and route it through the GC filter. It does filtering at an extreme level. But the oil flow is small and slow through the filter. It is in addition to the original oil filter. So worse case you still have the OEM oil filtration.

GC filters can also be used in fuel filtering as a polisher. I don’t think they flow enough to be the primary filter though.
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Old 05-04-2021, 10:40 PM   #19
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Thanks Comodave. I do completely understand the gulf coast filter is a bypass filter. What I am trying to determine exactly what my probable risk is. Seems the oil sample shows high lead but not other elements. So, why only lead? Seems odd. Would expect a broader spectrum of high readings. Confused.
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Old 05-04-2021, 10:56 PM   #20
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I am not an engine mechanic. But with only lead showing in the sample, maybe the sample was bad or the lab was wrong. Can you pull another sample and have it tested to see if the results are the same. I would use a different lab. I don’t see how the GC filter could be the issue. If anything it should help the engines health since the oil is supposed to be filtered to less than a micron. There was a lot of writing on them in the early years of PassageMaker Magazine.
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