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Old 08-30-2022, 08:29 PM #121
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took #2 again on a round trip from NH to MI. visited the inlaws in southern MI, and then went to north central MI to the camp.

drove great, mostly kept it to 65 or less, even in northern MI where the limit is 75.

2,040 miles, left last thursday, got home today (6 days). averaged a tic over 23 mpg.







overnight accomodations




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1987 4runner sr5, 22re, 5-speed
1988 4runner sr5, 3.0, auto (parts rig)
1987 4runner, sr5, 22re, 5-speed (#2)
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Old 09-05-2022, 12:35 PM #122
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for '87 #2, after doing the engine rebuild, i had noticed some coolant loss happening (although not actually loss). after extended interstate driving, the expansion reservoir would be overfull, and as the engine (and coolant) cooled, the expanded coolant would not return to the radiator. thus, rather than the radiator/cooling system being full to the top of the radiator neck, there would be space, sometimes just below the first layer of fins in the radiator. using a siphon, i could transfer the excess coolant in the expansion tank back to the radiator, and it would fill the radiator and leave the expansion tank full to the level i had initially set it to. so, not truly leaking, and not being consumed via combustion, either.

i pay attention to the temperature gauge, and since the rebuild, it has never run hot. if i avoided highway driving, and instead stayed on secondary roads where i might go 55 to 60 mph, the expansion tank never overflowed, and after cooldown, the radiator remained full. i put thousands of miles on it without losing coolant.

no external leaks, and when i rebuilt the motor, i used 100% new hoses for the entire cooling system, and replaced some of the heating system hardlines. one thing i never did after install was to recheck the head bolt torque values after initial install (where i torqued the bolts to correct value and in the correct order.

so, i pulled the valve cover and checked the torque, starting with the correct head bolt and proceeding to check all 10. i believe 4 were able to be turned before hitting the proper torque value, while the other 6 were at the correct value still.

after running to michigan and back, at highway speeds on the interstate (although i kept it to 65 mostly), the coolant level remained correct after cooldown. i suspect that there were combustion gasses entering the cooling system via the head gasket, which increased the pressure in the system and caused the coolant to expand into the reservoir (as it is supposed to). however, because of the gasses trapped in the coolant, once those reached the reservoir, the "air" bubbles escaped the system via the overflow outlet on the reservoir. when the engine cooled, the space previously occupied by the gas bubbles was accounted for by the excess head space in the radiator/cooling system, and the system wouldn't pull all the coolant back from the reservoir.

seems to be working now. probably should have checked the torque values a bit sooner than almost 2 years later.
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Old 01-07-2023, 01:20 PM #123
Junky4Rd Junky4Rd is offline
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I've only been a member for a short time but this is the best thread I've found so far, so I wanted to say thanks. I recently picked up an '86 that (probably) has not been driven since 2003 and I'm sure to run into issues that you've encountered and described here in great detail, so again, Thanks!

Disclaimer: I'm only up to March 2014 in this thread, but for now I've got frame work to do!

Last edited by Junky4Rd; 01-07-2023 at 01:22 PM.
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Old 05-01-2023, 10:02 AM #124
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Quote:
Originally Posted by wallytoo View Post
for '87 #2, after doing the engine rebuild, i had noticed some coolant loss happening (although not actually loss). after extended interstate driving, the expansion reservoir would be overfull, and as the engine (and coolant) cooled, the expanded coolant would not return to the radiator. thus, rather than the radiator/cooling system being full to the top of the radiator neck, there would be space, sometimes just below the first layer of fins in the radiator. using a siphon, i could transfer the excess coolant in the expansion tank back to the radiator, and it would fill the radiator and leave the expansion tank full to the level i had initially set it to. so, not truly leaking, and not being consumed via combustion, either.

i pay attention to the temperature gauge, and since the rebuild, it has never run hot. if i avoided highway driving, and instead stayed on secondary roads where i might go 55 to 60 mph, the expansion tank never overflowed, and after cooldown, the radiator remained full. i put thousands of miles on it without losing coolant.

no external leaks, and when i rebuilt the motor, i used 100% new hoses for the entire cooling system, and replaced some of the heating system hardlines. one thing i never did after install was to recheck the head bolt torque values after initial install (where i torqued the bolts to correct value and in the correct order.

so, i pulled the valve cover and checked the torque, starting with the correct head bolt and proceeding to check all 10. i believe 4 were able to be turned before hitting the proper torque value, while the other 6 were at the correct value still.

after running to michigan and back, at highway speeds on the interstate (although i kept it to 65 mostly), the coolant level remained correct after cooldown. i suspect that there were combustion gasses entering the cooling system via the head gasket, which increased the pressure in the system and caused the coolant to expand into the reservoir (as it is supposed to). however, because of the gasses trapped in the coolant, once those reached the reservoir, the "air" bubbles escaped the system via the overflow outlet on the reservoir. when the engine cooled, the space previously occupied by the gas bubbles was accounted for by the excess head space in the radiator/cooling system, and the system wouldn't pull all the coolant back from the reservoir.

seems to be working now. probably should have checked the torque values a bit sooner than almost 2 years later.

Are you running a stock-type thermostat in the coolant system or one of the dual stage? My 87 has always had a wonky cooling system that “works” but not quite right. For me it retains coolant but unless I idle it to running temps it briefly spikes before cooling back down shortly after.
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Old 05-06-2023, 12:13 AM #125
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Nice rig! Love the red
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