1988 Toyota 4Runner ALOT of il in coolant no coolant in oil

  • 6 CYL
  • 4WD
  • 145,000 MILES
I have a 1988 Toyota 4runner SR5 V6 (3vze), was driving it home and blew my top radiator hose
off the engine. Hose didn't blow out just off the water inlet. I put it back on real tight with the hose
clamp and a mile later it blew it off again. My wife said she had heard a squealing noise when she
had drove it earlier. The 4runner overheated, I had it towed home. At home I noticed there was ALOT
of oil now in my coolant, and I do mean ALOT, my oil dipstick registered very little left in my oil pan.
I natrually assumed it was the head gasket and went about tearing it down to replace the head
gaskets. Looking at the head gaskets that were on the truck I really didn't see any bad spots on
either side of them, but I am not a trained mechanic. SO, I went ahead and replaced the head
gaskets and head bolts, water pump and thermostat and all gaskets in the reassembling of the
top end (after taking my heads to the machine shop, where they told me after exam my heads were
fine and the milled em a little.).
Now 2 days later I have my 4runner back together and she starts right up and runs/idles like
a dream. Then the nightmare hits. Again. 8 min into her running nice. Boom the same
hose and clamp blow off, and low and behold, the same as when she broke down on the road,
the is most of my oil in the coolant again, and very little left in the oil pan? I have very little
if any coolant in my oil, but alot, lot, lot of oil in my coolant. It seems as though I am getting
some sort of extreme pressure build up into my coolant passages along with the oil being
forced into my coolant?
The coolant temp was not even half way when the hose blew off after the rebuild.
So now here I sit with no clue as to where to go from here? Any help or suggestions
would be awesome.
The 4runner is a 5spd not auto.

Thank you for any help, Todd S.
Do you
have the same problem?
Sunday, August 2nd, 2009 AT 2:44 AM

1 Reply

Hi there,

The first thing I would check is that the radiator is not blocked, this will have to be checked by a radiator repairer, also check the radiator cap is releasing at the correct pressure, next run the engine and have a head check done, this will detect exhaust gasses in the cooling system, start here.

Mark (mhpautos)
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Sunday, August 2nd, 2009 AT 5:22 AM

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