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1999 Mazda 626 Question: Would a head gasket cause coolant and alot of gas in the oil pan?

 

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bballerbies, 2.5L V6, Kennewick, WA, May 27, 2014, 20:58
 Rookie

So I put the head gaskets on the opposite heads. I got 30 psi compression, a no start, and some coolant and alot of gas in the oil pan. Would flipping the head gaskets to the correct heads fix these issues? Or does it even matter? Thanks in advance.

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  • Answer #1

    goodguy May 28, 2014, 06:07
     Master

    It would help the gaskets are designed to go on a certain way so the cooling system and oiling system run properly.the gskt should have a" this side up" stamped in the gskt!!!

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    bballerbies, May 28, 2014, 09:35
     Rookie

    Mine only seems to have a Left and a Right letter on each one. The left head is always the one closest to the radiator right?

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    goodguy, May 28, 2014, 11:52
     Master

    always look from the back of the engine and go from there, but yes this is usually on the front near the rad, but you must have something wrong because the compression should be higher than 30 psi

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    bballerbies, May 28, 2014, 12:47
     Rookie

    Ok so would flip flop head gaskets result in 30psi compression? I put new piston rings in just now as well as lapped all the valves. What could cause be causing this low of compression?

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    goodguy, May 28, 2014, 20:55
     Master

    are the rings installed properly, the ring gaps should not be lined up.Did it have low compression before? my advice would be to rebuild the whole engine , since you already had the pistons out you should have installed new rod and main bearings.

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    bballerbies, May 28, 2014, 21:49
     Rookie

    Thanks. No I did position the ring gaps in there proper O' clocks. And I did rebuild the whole engine. New rings new head gaskets new timing belt components new water pump. I didn't get new main and rod bearings because these ones looked fine. But when I put it back together, got the timing right and cranked it over. It had compression, in the 150ish range but didn't start. Had spark and plugs were soaked. After a while compression dropped to 30ish and there was atleast a gallon or two of gasoline in the crankcase. Puzzled. The oil in the crankcase might have been very low at the time of the second compression test. I'm in the process of redoing it now but do you have any clues?

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    goodguy, May 29, 2014, 04:00
     Master

    there shouldnt be that much fuel in the crankcase I would start by draining the oil and installing new oil then crank it over with the plugs out and see if you have a lot of fuel coming in , If so then you have a fuel pressure problem but Iwould start by turning it over and see what happens ,also make sure your timing is right.

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    bballerbies, May 29, 2014, 09:31
     Rookie

    Ok so if fuel pressure is too high then I should suspect fuel pressure regulator or something else?

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    goodguy, May 29, 2014, 15:15
     Master

    more than likely the regulator but did you change the head gskts around first

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    bballerbies, May 29, 2014, 17:39
     Rookie

    Ok so I put new head gaskets on. The right way. Put heads on. Drained the oil and changed the filter. Didn't but any oil in it or camshafts on yet but hand cranked the engine with compression gauge in #1 cylinder registered zero pressure. Is there a way I can get an accurate test without fully assembly the engine? also would gasoline washed cylinder walls test as low compression? Thanks for your help.

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    goodguy, May 29, 2014, 19:35
     Master

    if the fuel washed down the cyl you wont get any compression especially if you dont put oil in it there has to be oil in it to biuld up compression and you wont get a compression reading by cranking it by hand.

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    bballerbies, May 29, 2014, 23:09
     Rookie

    Alright thanks for the advice. I will do as you said and fill up the oil and then retest with the starter. I'll report my results after wards. Is it alright to test without the camshafts and valve cover on?

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    goodguy, May 30, 2014, 03:57
     Master

    yes it should be alright but I would recommend putting it back together properly to make sure you have your timings right and you dont have oil spewing out all over the place !!!

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