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Old 03-03-2015, 11:12 AM   #29
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I may need to look into the port sampling. For now I'm sampling from the dipstick tube with the J&G siphon pump.


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Old 03-03-2015, 11:49 PM   #30
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Because I use the transmission sampling to extend the interval, I installed a port on my Allison. It's cheap and simple. If you call JG Lube Services & talk to Barney, they sell a sampling fitting that mounts in a high pressure port low on the side of the Allison. It's a simple matter of taking out a plug & putting the fitting in. The fitting is approx $25.

Then taking a sample requires a "needle probe" which is a throw away. It takes less than 5 minutes to take a sample with the engine running and the transmission at operating temp. I highly recommend this method.

Since I don't try to extend oil change intervals but just use the testing of engine oil to monitor the health of the engine, I just catch a sample when I change oil.


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Steve did you install the port when changing the oil or did you try the "shop vac" method? I wouldn't mind installing a port, but I did read somewhere on the Allison site about sampling the transmission through the dipstick tube while the engine is running and the oil is at 170+ degrees. I did not leave the engine running in my initial pre-purchase sample. I intend to do this next time. I just recently acquired the sample kit and pump from JB. I no longer have to borrow one from our fuel and lube truck.
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Old 03-04-2015, 06:30 AM   #31
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Steve did you install the port when changing the oil or did you try the "shop vac" method? I wouldn't mind installing a port, but I did read somewhere on the Allison site about sampling the transmission through the dipstick tube while the engine is running and the oil is at 170+ degrees. I did not leave the engine running in my initial pre-purchase sample. I intend to do this next time. I just recently acquired the sample kit and pump from JB. I no longer have to borrow one from our fuel and lube truck.

With the engine off and transmission cold there was no more than a dribble out of the port. The port is in a fluid passage and when not circulating there is no fluid present. Installing the port takes 5 minutes.



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Old 03-04-2015, 09:38 AM   #32
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Because I use the transmission sampling to extend the interval, I installed a port on my Allison. It's cheap and simple. If you call JG Lube Services & talk to Barney, they sell a sampling fitting that mounts in a high pressure port low on the side of the Allison. It's a simple matter of taking out a plug & putting the fitting in. The fitting is approx $25.

Then taking a sample requires a "needle probe" which is a throw away. It takes less than 5 minutes to take a sample with the engine running and the transmission at operating temp. I highly recommend this method.

Since I don't try to extend oil change intervals but just use the testing of engine oil to monitor the health of the engine, I just catch a sample when I change oil.


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Thanks Steve. This is good info. Allison recommends a push button port sampler and using this lab testing info to extend oil usage. The recommended port sampler they use mentions nothing about a "needle probe". But, the end results is the same. Sample when hot, in neutral, running.

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Old 03-04-2015, 10:07 AM   #33
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Thanks Steve. This is good info. Allison recommends a push button port sampler and using this lab testing info to extend oil usage. The recommended port sampler they use mentions nothing about a "needle probe". But, the end results is the same. Sample when hot, in neutral, running.

Rick Y

Here is the sampling valve sold by JG:


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Old 03-04-2015, 10:34 AM   #34
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Steve, do they sell the throw-away probes as well? It looks like I need to upgrade my sampling.


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Old 03-04-2015, 12:47 PM   #35
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Steve, do they sell the throw-away probes as well? It looks like I need to upgrade my sampling.


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Yes. When I buy my sample kits I ask for the needle probe with each kit. I think they cost a buck. It's over kill to thrown away after one use. I always run a few ounces into a throwaway bottle before I pull the sample. That would purge any contamination from the previous sample. At a buck a year I just throw it away.


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Old 03-04-2015, 01:39 PM   #36
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Thanks.


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