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8-71 TI Temp

  • Thread starter Thread starter Capt Chad
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Capt Chad

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Dec 6, 2013
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218
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  1. OWNER - I own a Hatteras Yacht
Hatteras Model
46' CONVERTIBLE-Series I (1974 - 1981)
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
 
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.
 
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.
 
Maybe I can bribe somebody to sit beside that 8-71 with an IR gun...
 
If your anywhere near me I'll take a run with you.
 
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
 
You can switch the sending units from port to starboard to see if it’s the gauge
 
SEVEN said:
You can switch the sending units from port to starboard to see if it’s the gauge
Click to expand...
or switch the gauges if you dont want to mess with the coolant going everywhere
 
Thanks, I think I'm going to go ahead and order a set of thermostats. Did they come with gaskets?
 
I just replaced both of my heat exchangers on my 871 ti. After the replacement, they run just below 180 when running around 1900-2000 rpm.
 
Last edited:
Capt Chad said:
Thanks, I think I'm going to go ahead and order a set of thermostats. Did they come with gaskets?
Click to expand...

Yes you'll get a paper gasket with them, but you'll need to order the seals separately.
 
Thanks Skycheney. I Ordered gaskets separately but they can go into the box of spares. I located the thermostat housings last night while I was messing with another project. They point straight up toward the salon floor. The salon was carpeted pre-me. They covered everything but the center hatch. I have about 12" over the top of the housings. Has anybody pulled those seals without a slide hammer puller? Or am I cutting my carpet? Parts are supposed to be here Friday.
 
I'm not sure on the 871's but I think the seals are in the top part that you will be removing. Take out on the bench to replace the seals.

Also, try dropping the old thermostats in a pan of water on the stove. See if they open fully and at what temp. I just used my IR gun.
 
Thermostats made no change. In on my first hour of backflush with the Genesis method. I'll let you guys know how it works out.
 
Pull the he and get it cleaned at a radiator shop. It could be the closed circuit side.
 
Boatsb said:
Pull the he and get it cleaned at a radiator shop. It could be the closed circuit side.
Click to expand...

True. What coolant is in there? The green stuff or the newer purple PowerCool or such?

When was coolant last flushed/changed?
 
The red Detroit stuff. I let it run in the slip for a while and they both came up to about 150 on the thermostat housings. Maybe that got it... Won't know anything until I run it.

No, I haven't flushed the closed side. What kind of coolant are you guys running?
 
Distilled water and napacool.

We dont get too much cold weather here.
 
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