overheated my 340 today
#1196511
03/13/12 06:38 PM
03/13/12 06:38 PM
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Joined: Mar 2006
Posts: 241
wisconsin
dodger1
OP
enthusiast
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OP
enthusiast
Joined: Mar 2006
Posts: 241
wisconsin
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I have a stock 69 340 wasnt paying attention i was low on antifreeze she got hot and ive got antifreeze into my oil, i di a compression test and all cyl. are 130 to 150 my question is how do i find the culprit is it possible just the intake gasket blew or timing cover gasket how do i get the milk out of the engine before there damage whould it more likely be a head, just looking for a direction , also should i put oil back into the oilpan to prevent rust while im doing the heads thanks
Last edited by dodger1; 03/13/12 08:44 PM.
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Re: overheated my 340 today
[Re: dodger1]
#1196512
03/13/12 09:35 PM
03/13/12 09:35 PM
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Joined: Mar 2003
Posts: 4,848
Memphis
HemiRick
master
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master
Joined: Mar 2003
Posts: 4,848
Memphis
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Probably a failed head gasket or cracked head. Just drain the milkshake out and leave the pan under it for a while it'll mostly come out. You must have really got it hot, as it take a lot to get an iron headed motor to fail a head gasket.
Take care,
Rick
68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
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Re: overheated my 340 today
[Re: dodger1]
#1196515
03/14/12 03:12 PM
03/14/12 03:12 PM
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Joined: Nov 2004
Posts: 9,312
SoCal
68HemiB
master
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master
Joined: Nov 2004
Posts: 9,312
SoCal
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Quote:
yeah i cant believe i didnt catch the temp guage, the oil pan was way overfull it started to come out the dipstick, the compression test showed good on all cyl. does this mean the head gaskets are good,do tou think maybe intake or timing cover leak , thanks again
I don't want to rain on your parade, but you are grasping at straws if you think you have merely lost an intake gasket or timing cover gasket as a result of your overheating. Perhaps a thin spot in the casting of the timing cover itself let loose. With the volume of coolant into the oil pan you describe, that isn't a W.A.G. Nevertheless, your compression test results do not guarantee good head gaskets in all areas that need to have intact head gasket material, nor does it guarantee uncracked heads in all areas of the heads that need to be crack free.
Pulling BOTH the timing cover AND the heads is probably a good idea.
If you think one job is significantly easier than the other, you might do that task first - it's your choice.
Down to just a blue car now.
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Re: overheated my 340 today
[Re: 68HemiB]
#1196517
03/14/12 04:10 PM
03/14/12 04:10 PM
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Joined: Jan 2010
Posts: 1,944
woodcrest, CA
magnum440d100
top fuel
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top fuel
Joined: Jan 2010
Posts: 1,944
woodcrest, CA
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Quote:
Quote:
yeah i cant believe i didnt catch the temp guage, the oil pan was way overfull it started to come out the dipstick, the compression test showed good on all cyl. does this mean the head gaskets are good,do tou think maybe intake or timing cover leak , thanks again
I don't want to rain on your parade, but you are grasping at straws if you think you have merely lost an intake gasket or timing cover gasket as a result of your overheating. Perhaps a thin spot in the casting of the timing cover itself let loose. With the volume of coolant into the oil pan you describe, that isn't a W.A.G. Nevertheless, your compression test results do not guarantee good head gaskets in all areas that need to have intact head gasket material, nor does it guarantee uncracked heads in all areas of the heads that need to be crack free.
Pulling BOTH the timing cover AND the heads is probably a good idea.
If you think one job is significantly easier than the other, you might do that task first - it's your choice.
A frien of mine had a hole in the timing cover on his 318. He said it was from a worn chain, but I can't confirm. He bought the truck from a guy that thought it was a cracked head. The guy pulled one head, nope not there. My buddy pulled the other head. Nope, not there either. Both intake gaskets and head gaskets were intact. Pulled the timing cover and there was a hole on the water passage/port.
Good luck though. It's HARD to kill these smallblocks 
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Re: overheated my 340 today
[Re: magnum440d100]
#1196518
03/14/12 09:30 PM
03/14/12 09:30 PM
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Joined: Nov 2003
Posts: 3,106
Ridgeland Wi
mopars_1
master
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master
Joined: Nov 2003
Posts: 3,106
Ridgeland Wi
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id check all of the bearings too as antifreeze is hard on them... they might be toast.
1971 Plymouth Duster 340 auto
1937 Plymouth PT50
1969 Dodge Dart Swinger 340 4 speed
2013 Ram laramie 2500 hemi
2008 Harley FLSTSB springer
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Re: overheated my 340 today
[Re: Paul_Fancsali]
#1196522
03/20/12 06:07 PM
03/20/12 06:07 PM
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Joined: Mar 2006
Posts: 241
wisconsin
dodger1
OP
enthusiast
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OP
enthusiast
Joined: Mar 2006
Posts: 241
wisconsin
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thanks for the advice, i thought id take the easy way and just do the intake, after i started it up with fresh oil and new antifreeze, the car did idle but had a sluggish throttle ,i put my hand on the drivers side exhuast tip and the pressure was strong enough to blow my hand off the passenger side was weak my hand wasnt blown off, im guessing the pas. side head is either cracked or blowm gasket, no over heating, no oil in radiator, but after i shut the car off let it cool i pulled the rad. cap and it was almost fuul, i pulled the oil plug drained it (water again)i went to bed with the oil plug out when i woke up i found the radiator very low, checked the oil pan(i left the oil plug out) the antifreeze that was in the motor oil came out into the oil pan over nite, , anyway im gussing its the head or gasket but i was supprised all the fluid came out thanks again for the help
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Re: overheated my 340 today
[Re: dodger1]
#1196523
03/20/12 06:16 PM
03/20/12 06:16 PM
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Joined: Jan 2003
Posts: 74,978
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,978
U.S.S.A.
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Quote:
thanks for the advice, i thought id take the easy way and just do the intake, after i started it up with fresh oil and new antifreeze, the car did idle but had a sluggish throttle ,i put my hand on the drivers side exhuast tip and the pressure was strong enough to blow my hand off the passenger side was weak my hand wasnt blown off, im guessing the pas. side head is either cracked or blowm gasket, no over heating, no oil in radiator, but after i shut the car off let it cool i pulled the rad. cap and it was almost fuul, i pulled the oil plug drained it (water again)i went to bed with the oil plug out when i woke up i found the radiator very low, checked the oil pan(i left the oil plug out) the antifreeze that was in the motor oil came out into the oil pan over nite, , anyway im gussing its the head or gasket but i was supprised all the fluid came out thanks again for the help
You shouldn't leave the block out of that diagnoses .
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Re: overheated my 340 today
[Re: dodger1]
#1196525
03/20/12 09:18 PM
03/20/12 09:18 PM
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Joined: Jul 2003
Posts: 5,180
upstate western ny
sogtx
master
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master
Joined: Jul 2003
Posts: 5,180
upstate western ny
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You BETTer do the TC cover too, if its an old piece That is hopefully the culprit. Youll know when you take It apart 
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hopefully no cracked head. Iron can take a fair amount of abuse. 
You won't let this happen again! Replace gaskets and a few short cycle oil changes and short cycle coolant flushes and you should be back where you started. 
