Question about 1989 Honda Prelude

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Overheating and timing off

I redid the head on my 89 prelude(dual overhead cam fuel injected 2.0)last year and now i have overheated it somehow.i have changed the thermostat twice and i just took the water pump off and it looks fine.i did however run water in it during the summer instead of coolant.i put coolant/antifreeze in it when it started turning cold and then it started overheating.i did a cooling system flush before i put in antifreeze.i cannot figure out why its overheating.any suggestions?i also noticed when i took the crankshaft bolt off that my timing needle wasnt lined up but my camshaft gear arrows both point do i fix this?any info is very much appreciated

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  • phylersphan1 Jan 29, 2009

    i didnt do anything to the head.i put a straight edge on it and it wasnt warped.i have run a cooling system flush through it to get rid of corrosion.i would assume the damage was already done.what should the compression tester read?



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Do u know tHAT ANTI-FREEze/coolant should not be used alone in a cooling system? There are some coolants though that can be used just as it is in its concentrated form. But coolant is usally used in a 50:50 ratio ie half water half coolant. Too much coolant tends to corrode walls and ports. This can cause debris to possibly block the circuit, especially in the radiator. What u should check is to c if the water/coolant level drops when u overheat. That mean ur loosing pressure somehwere in the cooling system via a leak. Then u shiould c where the leak is coming from.

With reference to ur timings, if ur timings were out then ur vehicle wouldn't have start. I don't know about ur vehicle timings and the markings. But the basic principle is that the engine would usually be timed on #1 cylinder. U make sure #1 cylinder is placed on compression and the cams on the camshaft for #1 cylinder must be set in such a way that the valves must be closed. There are always markings though to know how to align for timings

Posted on Jan 29, 2009

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First of all, the overheating could have caused your engine to tighten up, which would account for the cams jumping a few teeth. Obviously being made from aluminium.
You should run coolant in the summer because it stops corrosion inside the cooling system.
When you redid the head gasket, did you have the head fly-cut or planed.
It should have been fly-cut.
It sounds like your head gasket has a leak between the water jacket and one of the cylinders.
This is causing the overheating.
That`s my best guess as I have had the same trouble with customers cars in the past.
Get a compression tester from an auto store and check pressures.
It screws into the spark plug holes

Posted on Jan 29, 2009

  • Steve Draper Jan 29, 2009

    I don`t know what the compression tester should read.
    Its all to do with the stroke and compression ratio of the cylinders.
    Just screw it into a plug hole after removing ignition leads(mark them) and get someone to crank the engine for a few turns. Make a note of the reading.
    Do this to each plug hole in turn.
    If you get a low reading between two cylinders, then the gasket has blown in that region between the cylinders.
    You can easily identify where it`s leaking if its a low reading on one cylinder.
    When you remove the head, it will warp, only slightly, but it will.
    A straight edge will not give you a true reading.
    From what you have told me, it definitely sounds like the head gasket has blown again.



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