Yanmar 4JHBE

wadanoli · 21-04-2008, 15:00

Hello ALL,
My Yanmar 4jHBE temp meter has stayed steady for all the years I have owned my 42 Catalina. Last week I notice that, 1. When I turn on the key my meter sometimes acts funny pegging and then jump around and then settled down.
Last week I went aground and stirred up a lot of dirt shortly before anchoring. The next day I did notice my temp meter was reading very hot so I slowed down and the temp moderated but not enough to my satisfaction. I anchored again and changed my thermostat and continued on (I have yet to test the old Thermostat to see if it is still good). The temp moderated even more, so I proceeded at a slower speed and the meter would move between normal (Which I think is 160F / 65C) and about 10 degrees above and back. I then changed the impeller (which the old one looked good). My Temp meter seems to still be about 10 degrees about what it should be. I was going to give my heat exchanger an acid wash and when I removed the antifreeze I could see my fresh water side of the heat exchanger was very clean and was contemplating pouring an acid wash through the saltwater side. I was wondering if anyone knew the normal temp for a Yanmar 4JHBE. I was also wondering if anyone had used and acid wash called ZIP (hydrochloric acid)?
Any information would be very helpful.
Dave

**Hud3** · 21-04-2008, 16:52

Before you go too far, check to see if your start battery is good. When it fails, the engine instrument panel goes bonkers.

DeepFrz · 21-04-2008, 19:54

Did you clean the strainer? Are you getting the normal amount of water out of your exhaust outlet?

wadanoli · 21-04-2008, 19:59

thanks for the suggestions. Yes I have checked both the sea strainer (that was the first thing) and the Battery I load tested today. Thanks. Do you know what normal temp is?

Alan Wheeler · 22-04-2008, 00:47

First off, if you had an erratic dial needle to begin with, I would check the electrical connections at the gauge and at the temp sender. Then I would test or replace the Temp sender before going any further with acid washing the heat exchanger.

GordMay · 25-04-2008, 04:15

Yanmar 4JH Series Engine Service Manual
Models 4JH(B)E , 4JH-T(B)E , 4JH-HT(B)E , 4JH-DT(B)E
http://sagaforumet.com/yanmar-manual/4JHE/manual.pdf

Yanmar Turbo’ 4JHE Series Engine Service Manual
Models 4JH3-TE / HTE / DTE
http://sagaforumet.com/yanmar-manual...JH3-manual.pdf

Published Yanmar Service Bulletins:
http://www.jboats.com/j105/resource/..._bulletins.pdf

Basic Engine Gauge Theory & Testing
http://www.cruisersforum.com/forums/...sting-645.html

**Hud3** · 25-04-2008, 06:27

Quote:

Originally Posted by wadanoli

Do you know what normal temp is?

My 4JH3E runs about 180 F, depending on sea temperature.

21-04-2008, 15:00	#1
wadanoli Registered User Join Date: Apr 2008 Location: Punta Gorda Florida Boat: Catalina 42 Janeway Posts: 4	Yanmar 4JHBE Hello ALL, My Yanmar 4jHBE temp meter has stayed steady for all the years I have owned my 42 Catalina. Last week I notice that, 1. When I turn on the key my meter sometimes acts funny pegging and then jump around and then settled down. Last week I went aground and stirred up a lot of dirt shortly before anchoring. The next day I did notice my temp meter was reading very hot so I slowed down and the temp moderated but not enough to my satisfaction. I anchored again and changed my thermostat and continued on (I have yet to test the old Thermostat to see if it is still good). The temp moderated even more, so I proceeded at a slower speed and the meter would move between normal (Which I think is 160F / 65C) and about 10 degrees above and back. I then changed the impeller (which the old one looked good). My Temp meter seems to still be about 10 degrees about what it should be. I was going to give my heat exchanger an acid wash and when I removed the antifreeze I could see my fresh water side of the heat exchanger was very clean and was contemplating pouring an acid wash through the saltwater side. I was wondering if anyone knew the normal temp for a Yanmar 4JHBE. I was also wondering if anyone had used and acid wash called ZIP (hydrochloric acid)? Any information would be very helpful. Dave

21-04-2008, 16:52	#2
Hud3 Moderator Moderator Join Date: Sep 2007 Location: Nevis, West Indies Boat: Island Packet 380, The Belle of Virginia (now sold) Posts: 5,087 Images: 16	Before you go too far, check to see if your start battery is good. When it fails, the engine instrument panel goes bonkers. __________________ Hud Nevis, West Indies Click to Search Cruisers Forum Archives

22-04-2008, 00:47	#5
Alan Wheeler Senior Cruiser Join Date: Dec 2003 Location: Marlborough Sounds. New Zealand Boat: Hartley Tahitian 45ft. Leisure Lady Posts: 8,042 Images: 102	First off, if you had an erratic dial needle to begin with, I would check the electrical connections at the gauge and at the temp sender. Then I would test or replace the Temp sender before going any further with acid washing the heat exchanger. __________________ Wheels For God so loved the world..........He didn't send a committee.

25-04-2008, 04:15	#6
GordMay CF Adviser Join Date: Mar 2003 Location: Thunder Bay, Ontario - 48-29N x 89-20W Boat: C.L.O.D. (Cruiser Living On Dirt) Posts: 13,439 Images: 233	Yanmar 4JH Series Engine Service Manual Models 4JH(B)E , 4JH-T(B)E , 4JH-HT(B)E , 4JH-DT(B)E http://sagaforumet.com/yanmar-manual/4JHE/manual.pdf Yanmar Turbo’ 4JHE Series Engine Service Manual Models 4JH3-TE / HTE / DTE http://sagaforumet.com/yanmar-manual...JH3-manual.pdf Published Yanmar Service Bulletins: http://www.jboats.com/j105/resource/..._bulletins.pdf Basic Engine Gauge Theory & Testing http://www.cruisersforum.com/forums/...sting-645.html __________________ Gord May ~~_/)_~~ (Gord & Maggie - s/v"Southbound") "If you didn't have time/$ to do it right in the first place, when will you get the time/$ to fix it?" Custom Search CF ➥ http://www.google.com/cse/home?cx=01...%3A2lb6ozabif0

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21-04-2008, 19:54	#3
DeepFrz Registered User Join Date: Mar 2006 Location: Winnipeg Boat: None at this time Posts: 1,190	Did you clean the strainer? Are you getting the normal amount of water out of your exhaust outlet?

21-04-2008, 19:59	#4
wadanoli Registered User Join Date: Apr 2008 Location: Punta Gorda Florida Boat: Catalina 42 Janeway Posts: 4	thanks for the suggestions. Yes I have checked both the sea strainer (that was the first thing) and the Battery I load tested today. Thanks. Do you know what normal temp is?

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