Freshwater since birth 8-71 TI's in my boat. They have ran up to 180 when pushed up past 17-1800 rpm since I got the boat. Like most they build little heat at idle. Now my stbd. side tries to get up around 190 if I push them. Port is still hanging tough at 180. So I changed the impeller on the stbd. side with no change. I have never cleaned the heat exchanger. Nor do I know many that have in freshwater. So... how bad is pulling the HE and cleaning it and how bad is pulling the thermostats. I currently find myself lacking in the mechanic category unless I wait for Diesel Don to make his rounds. The manual states that I will need a seal puller for the thermostats that alone makes it sound tougher than any thermostat replacement I have done. Does anyone have a Part# for 170 thermostats for the 8-71s? Thanks
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Thread: 8-71 TI Temp
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05-25-2018 03:32 PM #1Senior Member
- Join Date
- Dec 2013
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- 183
8-71 TI Temp
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Re: 8-71 TI Temp
Go on to u tube and watch some videos on Barnacle Buster. When you replaced the impeller where all the fins attached? Hit both motors with a heat gauge while running. The gauge it self might be going bad.
SEVEN
1979 53' MY Hull #563
Antioch, California
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05-25-2018 04:48 PM #3Senior Member
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- Dec 2013
- Posts
- 183
Re: 8-71 TI Temp
The old impeller looked good. I had it open so I replaced it anyway. I'm getting the temp reading on both stations. So it could be a sender I guess. Big problem is I have to be underway to get to the heating issue so it's hard to be at the helm and the ER all at the same time.
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05-25-2018 04:56 PM #4Senior Member
- Join Date
- Dec 2013
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- 183
Re: 8-71 TI Temp
Maybe I can bribe somebody to sit beside that 8-71 with an IR gun...
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Re: 8-71 TI Temp
If your anywhere near me I'll take a run with you.
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Re: 8-71 TI Temp
My 8-71’s were doing the same thing and I just did the flush of the HE with vinegar, circulated for about 6-7 hours, ran today and temp stayed below 180 at all RPMs very happy with the results and pretty easy to do once I got all the parts together. John
Mahalo V
1974 53 Motoryacht
Hull Number 406
San Diego, Ca. Ready 32 Nordic Tug, Brunswick Ga.
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Re: 8-71 TI Temp
You can switch the sending units from port to starboard to see if it’s the gauge
SEVEN
1979 53' MY Hull #563
Antioch, California
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05-25-2018 09:26 PM #8
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Re: 8-71 TI Temp
You can do it. Get a slide hammer seal puller and change the seals and thermostats. I'll bet you have one that is not fully opening. With a freshwater engine, I'll bet its not the heat exchanger.
https://dieselpro.com/detroit-diesel...al-186780.html
https://dieselpro.com/thermostat-for...0-degrees.html
https://www.harborfreight.com/heavy-...-pc-63268.htmlSky Cheney
1985 53EDMY, Hull #CN759, "Rebecca"
ELYC on White Lake--Montague, MI