How long can I run the engine without coolant? - Toyota Nation Forum : Toyota Car and Truck Forums
6th Generation (1988-1992) Specific discussion of the AE92

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#1 Old 09-10-2008, 03:59 PM
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How long can I run the engine without coolant?

I'm thinking I might need to run the engine with just the timing belt on
(no serpentine belt) during oil seal replacement. I know if the coolant
is still present, but the water pump isn't spinning, the temp gauge
will let me know how the car is doing and I can drive it a
short distance < 1 mile from a cold start before it reaches temperature.

However, if the coolant is drained to do the water pump, will the temp
gauge still work properly? Even if it does, I expect I'll have even less time.
Should I be able to make it < 1 mile at 30-45 mph?
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#2 Old 09-10-2008, 06:05 PM
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the temp gauge sensor is on the thermostat housing, i hope this answer your question
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#3 Old 09-10-2008, 06:12 PM
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AE92

... Have an engine running while working on it? I know for diagnostic reasons, but for repairs/ maintenances? I don't think you need to have the engine running to change the oil seal...

I wouldn't take a chance of driving/running a car without the serpentine belt (or have no coolant what so ever) unless all the necessary components are still ran by an intact belt or unless I'm stuck in the middle of a major highway with people doing 100mph+ left, right and overhead.

Without coolant, the temp sensors will not work right as it reads the coolant temp not the air temp.

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#4 Old 09-10-2008, 06:30 PM
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Without coolant present, you lose the "heatsink" that the coolant provides. This can cause serious overheating and hot spots often resulting in extensive damage. If the car is going to be run for more than 30-45 seconds, it should at least be filled with coolant. Even then, you need to be extremely cautious and run it for a very short time.


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#5 Old 09-10-2008, 07:32 PM
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...why do you want to drive the car <1 mile at 30 to 45 miles per hour?

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#6 Old 09-10-2008, 10:13 PM
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Quote:
Originally Posted by kcwa View Post
...why do you want to drive the car <1 mile at 30 to 45 miles per hour?
That is what I was wondering too.

N.E.O.
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#7 Old 09-10-2008, 11:29 PM
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30-45 mph because that's the speed limit where I need to move the car.

I can't leave the car where I'd be working on it, so the < 1 mile is the
drive from the work location to the overnight location. That way if I
could at least get the new timing belt on, I could park the car overnight
in a safe place and resume the next day. (Day one, strip the car down
to the old timing belt. Day two, replace timing belt. Day three, put
everything else back.) I know a good mechanic could probably do it in
4 hours (belt, both seals, and water pump) but I'm not a pro.

Otherwise, I'll need a tow truck or uhaul.

That, unless I can borrow someone's ACME portable hole.
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#8 Old 09-11-2008, 12:09 AM
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Tow it

Tow it, never drive a car without engine coolant.

Quote:
Originally Posted by tkw View Post
30-45 mph because that's the speed limit where I need to move the car.

I can't leave the car where I'd be working on it, so the < 1 mile is the
drive from the work location to the overnight location. That way if I
could at least get the new timing belt on, I could park the car overnight
in a safe place and resume the next day. (Day one, strip the car down
to the old timing belt. Day two, replace timing belt. Day three, put
everything else back.) I know a good mechanic could probably do it in
4 hours (belt, both seals, and water pump) but I'm not a pro.

Otherwise, I'll need a tow truck or uhaul.

That, unless I can borrow someone's ACME portable hole.
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#9 Old 09-11-2008, 12:12 AM
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#10 Old 09-11-2008, 01:32 AM
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I drove few km after my coolant boiled out. Warped head and blown headgasket resulted.
You're gonna shit that engine. Also do remember, the coolant temperature gauge wont work if you dont have any coolant in the engine.

You're gonna shit the engine already at startup if you run it without the serpentine belt wheel, the timing belt pulley wont stay put. Dumb idea.
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#11 Old 09-11-2008, 03:49 AM
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I think I'd figure out to put the crankshaft pulley back on if I cranked
the engine and the timing belt didn't move. Actually, it looks like
the crankshaft notch mates with the crankshaft sprocket so the the
pulley isn't under much load; without the serpentine belt, the pulley
would only have to prevent the sprocket from sliding out on the crankshaft.
A quick tightening to 20 ft-lbs should do the job enough to crank the engine.

The advice to at least crank it before putting everything back came from an
experienced mechanic actually. The idea is just to make sure it starts
up before you spend hours putting everything back.

Driving it like that is a different question--and why I asked.
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#12 Old 09-11-2008, 04:59 AM
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yeah, he sounds very experienced...
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#13 Old 09-11-2008, 06:57 AM
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Wouldn't it be easier to bring tools to where you are going to keep the car overnight and work on it there...instead of bringing the car to the tools? If not, it might be a lot cheaper in the long run to buy the few tools you will need to do this job...cheaper than a cooked motor.

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#14 Old 09-11-2008, 11:20 AM
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Quote:
Originally Posted by Flashmn View Post
yeah, he sounds very experienced...
Yeah, you'd rather put everything back and then find out there's a problem?
Nope, not going to do it. Letting it run from a cold start for 10 seconds
isn't going to hurt anything, especially in a non-interference engine.

I'd make a comment on your attitude, but I see you've already disclosed
that information in the description underneath your name.
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#15 Old 09-11-2008, 11:23 AM
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Quote:
Originally Posted by kcwa View Post
Wouldn't it be easier to bring tools to where you are going to keep the car overnight and work on it there...instead of bringing the car to the tools? If not, it might be a lot cheaper in the long run to buy the few tools you will need to do this job...cheaper than a cooked motor.
Problem is the lease contains a clause preventing car repair in the parking
lot. Some lady there complains when I work on the car and she's scary.
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