07-30-2016, 10:43 AM
If i got a free car, first thing, id do is make sure the valves are not bent.
its is an interference engine.
that means if you think the cams are out of time, for ANY REASON, stop and say to self
1: should i make it worse.
2: or do that leak down test. like we do on all interference engines.
we do that by hand using shop air.
we turn to it TDC firing, by hand and turn on the shop air and see the leak rate, OMG its 100% leaking, and hear it leaking to the air cleaner (bent valves)
it is what it is, and if cranking doesnt make a huge noise, the the compression test is safe. to do.
but... im not there and cant hear it crank,
in a pro shop, they tow it end and go , leakdown test. (dead engine) (after checking fuses, and that CEL lamp) key on.
the start can in fact bend the valves.
its a deal with twin cam engines, with some exceptions, my 1.8L Mazda is free running, engine. but not the J20 or even the V6.
its is an interference engine.
that means if you think the cams are out of time, for ANY REASON, stop and say to self
1: should i make it worse.
2: or do that leak down test. like we do on all interference engines.
we do that by hand using shop air.
we turn to it TDC firing, by hand and turn on the shop air and see the leak rate, OMG its 100% leaking, and hear it leaking to the air cleaner (bent valves)
it is what it is, and if cranking doesnt make a huge noise, the the compression test is safe. to do.
but... im not there and cant hear it crank,
in a pro shop, they tow it end and go , leakdown test. (dead engine) (after checking fuses, and that CEL lamp) key on.
the start can in fact bend the valves.
its a deal with twin cam engines, with some exceptions, my 1.8L Mazda is free running, engine. but not the J20 or even the V6.
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