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Old 12-08-2006, 05:55 PM   #1 (permalink)
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79 bronco whats wrong?

i have a 1979 bronco with a 400m and a c6 trans. and when you start it up it sounds ok at first then after about 5-10 seconds it starts to make a really loud screaching sound. first i checked all tha accesories by taking the belts off and it still made the sound. ive asked a few other people if they know what it might be and i got 3 different answers. 1 said it is the oil pump, 1 said it was a bearing in the motor, and 1 said it could be something with the transmission. please tell me what you think. and if it is the oil pump or transmission i can do it easily since i already have spare oil pumps and a c6 from my 78.
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Old 12-08-2006, 06:03 PM   #2 (permalink)
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What about the water pump, just a thought?
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Old 12-08-2006, 06:13 PM   #3 (permalink)
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Quote:
Originally Posted by zakt
What about the water pump, just a thought?
i already replaced that after i heard the sound. thats what i thought it was at first. but its not.
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Old 12-08-2006, 07:43 PM   #4 (permalink)
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Use a piece of hose up to your ear like a stethascope to see where the sound is coming from. Also what's you oil pressure look like?
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Old 12-08-2006, 08:00 PM   #5 (permalink)
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Quote:
Originally Posted by BroncoShawn
Use a piece of hose up to your ear like a stethascope to see where the sound is coming from. Also what's you oil pressure look like?
thanks for the idea. i dont know about the oil pressure but i will look at it tomorrow.
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Old 12-08-2006, 08:38 PM   #6 (permalink)
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Does it do it in gear, or does it get worse as the revv's rise? How does your oil itself look? Take a piece of white paper, and wipe your dipstick on it. Hold it up to some good light, take a looksie.
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Old 12-08-2006, 10:15 PM   #7 (permalink)
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Quote:
Originally Posted by masterbeavis
Does it do it in gear, or does it get worse as the revv's rise? How does your oil itself look? Take a piece of white paper, and wipe your dipstick on it. Hold it up to some good light, take a looksie.
yes it goes into gear. it happened when i was leaving my house going up my driveway and it started making the sound. the oil looks alright. that was one of the first few things i checked. and it was perfect on the fill level and looked normal. what should i look for in the oil though?
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Old 12-09-2006, 02:44 AM   #8 (permalink)
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sounds like your tranny pump and/or converter.
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Old 12-09-2006, 09:18 AM   #9 (permalink)
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Quote:
Originally Posted by fordman1978
yes it goes into gear. it happened when i was leaving my house going up my driveway and it started making the sound. the oil looks alright. that was one of the first few things i checked. and it was perfect on the fill level and looked normal. what should i look for in the oil though?
You are looking for things that dont come out of the bottle, like glitter (metal shavings)


Is it possible on a Furd to take the torque converter nuts off, push it back and run the motor without turning it? That could isolate the noise location
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Old 12-09-2006, 09:21 AM   #10 (permalink)
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Quote:
Originally Posted by bronco69drp
sounds like your tranny pump and/or converter.
thanks for the help. ill have to check that.
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Old 12-09-2006, 09:27 AM   #11 (permalink)
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Quote:
Originally Posted by masterbeavis
You are looking for things that dont come out of the bottle, like glitter (metal shavings)


Is it possible on a Furd to take the torque converter nuts off, push it back and run the motor without turning it? That could isolate the noise location
umm i dont really think so.. not unless i unbolt the whole tranny, slide it back and do it. but then i still have to bolt it back up to put the starter on..
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Old 12-09-2006, 01:08 PM   #12 (permalink)
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well i have been out working on the bronco all morning. and it started right up just like yesterday. but now its not making that same sound. now its just running kinda rough, overheating while idling (thats all ive done with it though) and steaming from somewhere towards the back.. it didnt do any of this a few weeks ago when i parked it because of the noise.. so any new ideas anybody?
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Old 12-09-2006, 03:00 PM   #13 (permalink)
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how is the fan workin?is it intact or broke down and how does the radiator look itself and the fluid in it.I am thinking the fan is fried but one other place to look is the heater core or heater core lines maybe the fan is some how getting wet or just plain nasty.Has the heater been on at all during this?Climb under it when it starts leaking see where it drips down maybe a front pump seal but that shouldnt make it run roughly or once again check the oil and side of the block for coolant.
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Old 12-09-2006, 05:00 PM   #14 (permalink)
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A friend of mine had a similar issue a few years back with his 78 Bronco and a 400M. The Bronco ran fine, then after it started to heat up, it sounded like a tea pot was about to explode! It turned out to be a cracked head. Got some heads from the salvage yard, had them rebuilt at a machine shop, and put them on. Issue resolved.
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Old 12-09-2006, 08:32 PM   #15 (permalink)
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Quote:
Originally Posted by 76HighBoy
A friend of mine had a similar issue a few years back with his 78 Bronco and a 400M. The Bronco ran fine, then after it started to heat up, it sounded like a tea pot was about to explode! It turned out to be a cracked head. Got some heads from the salvage yard, had them rebuilt at a machine shop, and put them on. Issue resolved.
thanks for the help. i was thinking it might be a head gasket after it started steaming. but i will check that out tomorrow. and luckily i already have 4 heads sitting in the shop from my old truck. and some haed gaskets also.
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Old 12-10-2006, 10:37 AM   #16 (permalink)
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If you can you might want to rebuild the engine to get it all working right so you wont have to go back in incase something brakes next
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Old 12-10-2006, 04:46 PM   #17 (permalink)
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Quote:
Originally Posted by rocknbronco
If you can you might want to rebuild the engine to get it all working right so you wont have to go back in incase something brakes next
i would but i am trying to fix it for cheap because i cant afford it and i am trying to sell it..
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Old 12-10-2006, 05:31 PM   #18 (permalink)
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Are you sure it isn't a bad water pump?
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Old 12-10-2006, 05:47 PM   #19 (permalink)
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Quote:
Originally Posted by BroncoShawn
Are you sure it isn't a bad water pump?


Quote:
Originally Posted by zakt
What about the water pump, just a thought?


i already replaced that after i heard the sound. thats what i thought it was at first. but its not.
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Old 12-10-2006, 06:41 PM   #20 (permalink)
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did u check and make sure the starter drive isnt stuck in the flywheel and not retracting i had one like that the starter screamed like hell
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Old 12-10-2006, 07:34 PM   #21 (permalink)
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yea that happened with my f-150 a few times but this is a totally different sound. but the sound has seemed to stop and now it is steaming out from towards the back..
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