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87 Mazda RX7 overheated but was running when I parked it now it won't start
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mymymy1960
New User
Sep 5, 2011, 12:35 PM
Post #1 of 10
(3929 views)
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87 Mazda RX7 overheated but was running when I parked it now it won't start
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I have a 1987 Mazda RX7 it has a 13b rotary motor with 121,000 miles on it i was driving back from Boston about 120 miles and the temp gauge kept rise and lowwering about 80 miles into the drive it overheated and I stopped to let the motor cool I had just changed the heater hose and antifreeze and had a gallon of water in the car just in case I had an issue a few months earlier with a leak in the same hose and shortened it and was on my way after it cooled down now 4 months later it overheated again this time no leak after it cooled and refilled radiator I drove about 12 miles and it overheated again I repeated cooling it down and replaceing radiator fluid with water this went on a few more times till I got home it was running when I parked in the yard but was very hot now it won't start is the mootor cooked it still turns over and sounds like it wants to start and it actually started for about 20 seconds till I took my foot off the acelerator now all it does is turns over I pulled the plugs and changed the oil and stuck my finger in the spark plug holes and it seems to have compression any suggestions on what else I might be able to do it was a great running motor until this happened
(This post was edited by mymymy1960 on Sep 5, 2011, 7:18 PM)
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Mr.scotty
Enthusiast
Sep 5, 2011, 3:59 PM
Post #2 of 10
(3898 views)
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Re: 87 Mazda RX7 overheated but was running when I parked it now it won't start
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You will need a compression tester to test the compression properly.
A engine needs compression,spark,fuel to run, one of the three is missing.
Do a fuel pressure test also and check for spark.
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Your only as good as your tools!
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 5, 2011, 4:51 PM
Post #5 of 10
(3887 views)
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Re: 87 Mazda RX7 overheated but was running when I parked it now it won't start
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Yeah, sure he was.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
/ Moderator
Sep 5, 2011, 4:55 PM
Post #6 of 10
(3883 views)
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Re: 87 Mazda RX7 overheated but was running when I parked it now it won't start
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You never know. He might be a master rotary technician. 
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 5, 2011, 4:56 PM
Post #7 of 10
(3879 views)
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Re: 87 Mazda RX7 overheated but was running when I parked it now it won't start
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Yeah, sure he is
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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mymymy1960
New User
Sep 5, 2011, 7:13 PM
Post #8 of 10
(3870 views)
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Re: 87 Mazda RX7 overheated but was running when I parked it now it won't start
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I admit I don't know much about rotary motors but I do have a manuel for the vehicle and I was able to look up some things online about them and it was suggested as a quick check to remove the lowwer spark plugs and to hold your finger over the spark plug hole and to have someone else turn over the motor and watch the timing mark on the cam shaft pully that you should feel 3 puffs of air come out of that cylinder per revolution of the pulley and then it explained how to check the compression with a tester and gave the psi for a good through a not so good reading on the compression gage by the way I didn't lose the tip of my finger lol. Next step. Is to find a mechanic that work can on these motors it was a little difficult finding one on Labor Day weekend and the nearest Mazda dealership is 30 miles away but that will be my last resort I bought parts there resently and paid through the nose for them but that's the price you pay for haveing a car like this and I will take the advive about finding someone qualified to work on the motor
(This post was edited by mymymy1960 on Sep 5, 2011, 7:20 PM)
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Mr.scotty
Enthusiast
Sep 5, 2011, 8:26 PM
Post #9 of 10
(3862 views)
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Re: 87 Mazda RX7 overheated but was running when I parked it now it won't start
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Thanks DS yeah I was generalizing.
I am actually big into mazdas and I know rx-7's and rx-8's are both a 1.3 liter rotary engine.
I own two 80's mazdas.
I also have a repair manual for this exact car.
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Your only as good as your tools!
(This post was edited by Mr.scotty on Sep 5, 2011, 8:45 PM)
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zmame
Veteran
/ Moderator
Sep 8, 2011, 5:42 PM
Post #10 of 10
(3813 views)
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Re: 87 Mazda RX7 overheated but was running when I parked it now it won't start
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The engine will more then likely need to be torn down and inspected.. You need a special compression tester to test compression in a rotory.. you can use a conventional tester if you take the shrader valve out and watch for 3 consecutive beats.. but it's not as accurate.
On the rotor of the rotory engines there are side seals (sort of like piston rings). You more likely fried those seals when you overheated your engine.
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