1jz engine new weird problem

[Hash_ra23]

But I can see that the valves are closed on cylinder one at TDC. (crank pulley mark at 0, both camshaft marks lined up)
Then as i rotate, the next valve to open is exhaust, and then intake. That would mean they are in sync the way it should be wouldnt it?
I dont really wanna pull the crank pulley off again if i dont have to.

[HAVABEER]

i'd buy a proper compression tester.

also comparing it to your other 1jz with a BHG isn't going to help much, as a blown head gasket can happen on any cylinder not just the #1, so just coz your other engine isn't getting compression on #1 cylinder doesn't mean its a BHG

[wilbo666]

But I can see that the valves are closed on cylinder one at TDC. (crank pulley mark at 0, both camshaft marks lined up)
Then as i rotate, the next valve to open is exhaust, and then intake. That would mean they are in sync the way it should be wouldnt it?
I dont really wanna pull the crank pulley off again if i dont have to.

Sounds right to me, follow link, and watch little animation

http://www.howstuffworks.com/engine1.htm



As said, getting a compression tester and hooking up a starter motor etc isn't a bad idea if you are concerned

Cheers
Wilbo

[Hash_ra23]

i'd buy a proper compression tester.

also comparing it to your other 1jz with a BHG isn't going to help much, as a blown head gasket can happen on any cylinder not just the #1, so just coz your other engine isn't getting compression on #1 cylinder doesn't mean its a BHG

nahh thats not what i was testing. I know its got a BHG for other reasons.
I just wanted to feel some compression on the engine i'm replacing it with and i can't. and i dont know why.

I'm not expecting to be able to get numbers from using my finger..
But i expect to feel SOMETHING, with all valves closed and piston pushing on my finger. And i expect it to be harder to turn over with spark plugs in there than without.

[Hash_ra23]

Sounds right to me, follow link, and watch little animation

http://www.howstuffworks.com/engine1.htm

Do i sound that noobish?

[barned01]

ok now i will try and top your noobish feelings.
does oil need to be in the pan and circulating to the pistons to get a bit of compression in the first instance?
ie if you poured a tablespoon of oil in the cylinders first to cause a seal to occur? if you get compression with oil in the cylinders, it could be a sign the engine is able to give compression. If still no compression then there are other fish to be frying still, possibly timing related.

Also if the engine does end up being stuffed, i would have thought that the import yard would have some sort of warranty for something that is a month old assuming the guy you bought it off provided a receipt.

[Hash_ra23]

ok now i will try and top your noobish feelings.
does oil need to be in the pan and circulating to the pistons to get a bit of compression in the first instance?
ie if you poured a tablespoon of oil in the cylinders first to cause a seal to occur? if you get compression with oil in the cylinders, it could be a sign the engine is able to give compression. If still no compression then there are other fish to be frying still, possibly timing related.

Also if the engine does end up being stuffed, i would have thought that the import yard would have some sort of warranty for something that is a month old assuming the guy you bought it off provided a receipt.

I thought that mite be a reason, I've decided im just gonna chuck it in and see what happens. I'm 99% sure the timing is right.

and nahh no receipt, and its older than a month now anyway

cheers.

[HAVABEER]

wouldn't it be easier to be 100% sure the timing is right.... THEN chuck it in? will probably save you a few pennies in the swear jar

[Hash_ra23]

well i put the engine in..and yep it didnt make any compression.
So what i did was set it at TDC (crank at 0 and cams at 0), rotated the crank 360degrees, so the crank was lined up with the 0 mark, but the cams were out by 180degrees. And then set the cams to 0 at this point.
So overall i dont see how its any different since rotating the crank 360degrees and rotating the cams 180 degrees theoretically shud be the same point. Its not like the piston knows its sposed to be on the end of the exhuast stroke or the end of the compression stroke.

Anyway. This got it running .

[HAVABEER]

aren't you ment to rotate it 720 degree's to check to make sure everything lines up properly?


but hey if its running its running?

[Hash_ra23]

yeah i did..everything was definitely lined up. Just 360degrees out! Im gonna use the other 1jz to figure out exactly what happened and get back to you

[SL666]

confused = me

when you say it didn't make any compression in the car, is that via comp gauge, or it not firing?

(trying to remember if the CAS is on the cam or crank)

[The Real Roadrunner]

well i put the engine in..and yep it didnt make any compression.
So what i did was set it at TDC (crank at 0 and cams at 0), rotated the crank 360degrees, so the crank was lined up with the 0 mark, but the cams were out by 180degrees. And then set the cams to 0 at this point.
So overall i dont see how its any different since rotating the crank 360degrees and rotating the cams 180 degrees theoretically shud be the same point. Its not like the piston knows its sposed to be on the end of the exhuast stroke or the end of the compression stroke.

Anyway. This got it running .

The crank angle sensor was probly in the wrong position causing the ECU to get a sync error.

but i dont understand why it didn't have comp?

[LeeRoy]

rotated the crank 360degrees, so the crank was lined up with the 0 mark, but the cams were out by 180degrees. And then set the cams to 0 at this point.

2 crank revolutions = 1 cam revolution.
TDC to 180* crank = intake stroke, intake valves open
180* crank to TDC = compression stroke, no valves open
TDC to 180* crank = ignition and burn stroke, no valves open
180* crank to TDC = exhaust stroke, exhaust valves open.

Set crank to 0 which is TDC #1, then set cams so they line up with markers and put belt on making sure the non tensioned side is tight.