454 Overheat or Sensor issue
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=46795
Printed Date: April-29-2024 at 11:31pm
Topic: 454 Overheat or Sensor issue
Posted By: tbeard
Subject: 454 Overheat or Sensor issue
Date Posted: September-08-2018 at 8:53pm
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Our 89 BFN 454 is running temperature between 190 - 200 in the lake. Thermostat installed is a 170 degree. (I have not pulled thermostat yet) I pulled the impeller and it looks great. Also checked all hoses for tightness. Removed the water strainer re- wrapped both input and output fittings with Teflon tape. Ran boat and let it get to 190 on gauge. I used a IR Thermostat and took several readings around the block. See below. Could I have a failing sensor or a true overheating problem. 150 - Thermostat Housing, 140-Intake, 140 - R Head front, 150 - L head front, 140 - R head rear, 145 - L head rear, 115 - intake, 150- Block front 130 - Block back. 155 - Block by sensor ------------- Thanks.......Tom |
Replies:
Posted By: KENO
Date Posted: September-08-2018 at 9:40pm
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With the readings you took, it says that your temperature gauge or sensor is reading high and you don't have an overheating problem.. If you put your hand on a 190 degree thermostat housing it will hurt/burn Put it on a 150 degree housing and it'll feel pretty hot. That'll help tell you if the IR gun seems to be giving true temperatures You could also aim the gun at a pan of boiling water and see if it reads about 212 degrees to check it. |
Posted By: tbeard
Date Posted: September-08-2018 at 10:06pm
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Thanks......Would it help to install a 150 degree thermostat? Currently running a 170. ------------- Thanks.......Tom |
Posted By: 8122pbrainard
Date Posted: September-08-2018 at 11:53pm
No
------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
tbeard wrote:Posted By: tbeard
Date Posted: September-09-2018 at 6:03pm
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Thanks Pete.......I could not find the required temperature for a 454 in the PCM manual. Does anyone know what is recommended by PCM? ------------- Thanks.......Tom |
Posted By: MrMcD
Date Posted: September-09-2018 at 8:16pm
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The open cooling systems (lake Water) should have had a 140 thermostat factory. The closed cooling systems ran higher temps. I was told Marine engines ran the cooler thermostats to reduce corrosion in the block. The later fuel injected engines also ran higher temps, 160 mainly. ------------- |
Posted By: tbeard
Date Posted: September-09-2018 at 11:57pm
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Thanks Mark......My Thermostat is a 170 installed by previous owner. I pulled it today and did the hot/cool water test and thermostat worked great. Re-torqued all hose clamps and I did find a raw water pump input hose that was not tight! Will test it again tomorrow. ------------- Thanks.......Tom |