79 bronco whats wrong? - Pirate4x4.Com : 4x4 and Off-Road Forum

fordman1978 · 12-08-2006, 05:55 PM

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.

zakt · 12-08-2006, 06:03 PM

What about the water pump, just a thought?

fordman1978 · 12-08-2006, 06:13 PM

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.

BroncoShawn · 12-08-2006, 07:43 PM

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?

fordman1978 · 12-08-2006, 08:00 PM

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.

masterbeavis · 12-08-2006, 08:38 PM

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.

fordman1978 · 12-08-2006, 10:15 PM

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?

bronco69drp · 12-09-2006, 02:44 AM

sounds like your tranny pump and/or converter.

masterbeavis · 12-09-2006, 09:18 AM

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

fordman1978 · 12-09-2006, 09:21 AM

Quote:

Originally Posted by bronco69drp

sounds like your tranny pump and/or converter.

thanks for the help. ill have to check that.

fordman1978 · 12-09-2006, 09:27 AM

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..

fordman1978 · 12-09-2006, 01:08 PM

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?

rocknbronco · 12-09-2006, 03:00 PM

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.

76HighBoy · 12-09-2006, 05:00 PM

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.

fordman1978 · 12-09-2006, 08:32 PM

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.

rocknbronco · 12-10-2006, 10:37 AM

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

fordman1978 · 12-10-2006, 04:46 PM

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..

BroncoShawn · 12-10-2006, 05:31 PM

Are you sure it isn't a bad water pump?

multichamp · 12-10-2006, 05:47 PM

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.

79 super f150 4x4 · 12-10-2006, 06:41 PM

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

fordman1978 · 12-10-2006, 07:34 PM

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..

12-08-2006, 05:55 PM	#1 (permalink)
fordman1978 Registered User Join Date: Dec 2006 Member # 83545 Location: North Plains Oregon Posts: 1,005	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.

12-09-2006, 02:44 AM	#8 (permalink)
bronco69drp Registered User Join Date: Oct 2004 Member # 36795 Location: cordova, tn(near memphis) Posts: 262	sounds like your tranny pump and/or converter. __________________ Derek: '69 bronco crawler/ 5.0 HO EFI/ 1 tons & 42''s

12-09-2006, 03:00 PM	#13 (permalink)
rocknbronco Registered User Join Date: Aug 2005 Member # 51692 Location: Flat Top MTN,TN Posts: 1,780	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. __________________ Space for rent sold it all....

12-09-2006, 05:00 PM	#14 (permalink)
76HighBoy Registered User Join Date: May 2005 Member # 47479 Location: Hubert, NC Posts: 209	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. __________________ [FONT="Comic Sans MS"]Every day is a good day when you wake up, it's the rest of your day that goes to crap![/FONT]

12-10-2006, 10:37 AM	#16 (permalink)
rocknbronco Registered User Join Date: Aug 2005 Member # 51692 Location: Flat Top MTN,TN Posts: 1,780	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 __________________ Space for rent sold it all....

12-08-2006, 06:03 PM	#2 (permalink)
zakt Registered User Join Date: Sep 2005 Member # 52979 Location: San Diego, CA Posts: 239	What about the water pump, just a thought?

12-08-2006, 07:43 PM	#4 (permalink)
BroncoShawn Registered User Join Date: Nov 2006 Member # 82395 Location: Johnson City TN Posts: 50	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?

12-08-2006, 08:38 PM	#6 (permalink)
masterbeavis Registered User Join Date: Jan 2002 Member # 9468 Location: Eldorado BFE, East of sac Posts: 2,827	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.

12-09-2006, 01:08 PM	#12 (permalink)
fordman1978 Registered User Join Date: Dec 2006 Member # 83545 Location: North Plains Oregon Posts: 1,005	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?

12-10-2006, 05:31 PM	#18 (permalink)
BroncoShawn Registered User Join Date: Nov 2006 Member # 82395 Location: Johnson City TN Posts: 50	Are you sure it isn't a bad water pump?

12-10-2006, 06:41 PM	#20 (permalink)
79 super f150 4x4 Registered User Join Date: Oct 2006 Member # 81572 Location: greenville ohio Posts: 36	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

12-10-2006, 07:34 PM	#21 (permalink)
fordman1978 Registered User Join Date: Dec 2006 Member # 83545 Location: North Plains Oregon Posts: 1,005	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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