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Old 06-01-2009, 19:41   #1 (permalink)
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'86 5.8 -- coolant leak problem

hey, i'm sort of new to fords and this is a bit confusing for me...

i just bought this truck cheap, with a blown head gasket (or so i thought). when i got into it, there was coolant in several of the
combustion chambers (but no oil) on both sides, and only at the back of the engine. i'd have thought it was a cracked head, but it's both sides and literally mirrored, which seemed odd to me. there's coolant getting in the oil as well, but no oil in the coolant. i changed the head gaskets (which actually seemed in pretty good shape when i pulled it apart), and i'm having the same problem.

could the block be damaged internally? also, since there's coolant running through the intake manifold (i've never dealt with that either), could it have something to do with that?

i've got no external coolant or oil leaks now. just this coolant seeming to get everywhere inside the engine.

what's going on? heh
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Old 06-01-2009, 20:23   #2 (permalink)
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Re: '86 5.8 -- coolant leak problem

under the intake, there are some coolant lines. sometimes they crack, and it will leak in the front, back sides, and other areas that don't make sense, had a similar problem with a 94 and 90 f150 5.0 hope it helps
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Old 06-01-2009, 21:20   #3 (permalink)
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Re: '86 5.8 -- coolant leak problem

i wondered if that may be what's happening. how would i test it without buying a new intake? i can't even seem to find one that's not performance...and cost as much as i paid for the truck. heh
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Old 06-02-2009, 07:12   #4 (permalink)
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Re: '86 5.8 -- coolant leak problem

(it is fuel injected right?) if so the lines run under the intake manifold and through the throttle body. it doesn't run through the intake manifold. had the same problem, couldn't find the leak and went through hell pulling heads, radiator, water pump, heater core, etc. and turns out it was a split line
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Old 06-02-2009, 08:55   #5 (permalink)
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Re: '86 5.8 -- coolant leak problem

nar, it's a carbie. you mean the lines were outside of the intake itself? i mean...under it, or at the bottom of it?
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Old 06-02-2009, 09:11   #6 (permalink)
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Re: '86 5.8 -- coolant leak problem

1986 f-150......cleveland or windsor. i would have thought clevo. theres no coolant in the intake manifold if it's a clevo.
to confirm a few of the things u said u have coolant in the combustion chambers. possibly head gasket or cracked head. coolant in the intake. well difficult but possible if the cooling system was pressure tested with the intake valves open it could force coolant into the intake but it'd be more likely and cracked head than the head gasket.
coolant in oil....thats usually terminal. cracked block! did u get the heads checked when u took them off (by an engine shop?)
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Old 06-02-2009, 09:46   #7 (permalink)
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Re: '86 5.8 -- coolant leak problem

I agree, most likely a warped or cracked head
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Old 06-02-2009, 10:45   #8 (permalink)
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Re: '86 5.8 -- coolant leak problem

no, i didn't have them checked. is it not that odd that only the rear two chambers on both sides had water in them?
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