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| Engine Rebuilt, almost no compression | |
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| Tweet Topic Started: Oct 26 2013, 06:18 PM (3,401 Views) | |
| Frozen_Joker | Oct 27 2013, 03:51 PM Post #16 |
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Elite Member
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I still have the same compression with the retime. So I am beginning to wonder about this head gasket. Everything else was good. And considering I am getting low compression across all cylinders, It would have to be something as a whole. |
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| Hydrojim | Oct 27 2013, 03:59 PM Post #17 |
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What brand of head gasket did you use?
Edited by Hydrojim, Oct 27 2013, 04:00 PM.
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| Frozen_Joker | Oct 27 2013, 04:03 PM Post #18 |
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Elite Member
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Fel-Pro. And I have never had an issue there. But I think I am now. Because I just now looked at some pics of different brands and Fel-Pro. Fel-Pro looked totally different. In fact when I lined it up it didn't look right having holes where there was no holes in the block. Also I noticed some of the holes in the gasket were A LOT smaller than the holes in the block. |
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| PTA2PTB | Oct 27 2013, 04:04 PM Post #19 |
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I'm totally awesome! I swear.
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Oops, I guess I got my wires a little crossed there, and forgot what type of engine were were talking about. *PTA2PTB recoils at the thoughts of having distributed misinformation* I still think it's a timing issue - involving the cam, for the the compression to be that low, and on all cyl's, following a fresh rebuild. Since he has lash-adjuster rocker arms, it can't be hydraulic lifters that are too pumped full of oil. |
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| Frozen_Joker | Oct 27 2013, 04:05 PM Post #20 |
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Elite Member
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I have adjusted the rocker arms as per torque specs and everything. I have triple checked timing. Still the same compression. |
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| PTA2PTB | Oct 27 2013, 04:14 PM Post #21 |
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I'm totally awesome! I swear.
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If you were losing that much compression, through all 4 cyl's, all that compressed gas would have to be going, somewhere; and be detectable. Take your radiator cap off and look inside, while someone cranks the engine over. If you were losing that much compression through your headgasket, there's a fair chance you'll see bubbles coming up in the radiator. If not, it would have to be going into your oil galleys. Not sure how you'd go about finding it, butt if you open up a passage - somewhere, you should encounter an oil-fart; which would be a relief, to have, at least, found it, even if the thought of having to replace it, stinks. |
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| Frozen_Joker | Oct 27 2013, 04:26 PM Post #22 |
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Elite Member
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No bubbles from the radiator. And no fart from the oil cap or anything. The exhaust blows out the piece of paper and doesn't suck it in. |
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| PTA2PTB | Oct 27 2013, 04:30 PM Post #23 |
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I'm totally awesome! I swear.
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Did you "disengage the fuel injector wire harness at the couplers" (like you're supposed to), before doing the compression test? |
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| Frozen_Joker | Oct 27 2013, 04:34 PM Post #24 |
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Elite Member
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Yes sir. I torqued the head bolts down to 49Ft Lbs. Should I go further? |
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| Hydrojim | Oct 27 2013, 04:36 PM Post #25 |
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is your throttle all the way open during the compression test? |
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| Frozen_Joker | Oct 27 2013, 04:38 PM Post #26 |
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Elite Member
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Yes it is Hydro. |
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| Old Man | Oct 27 2013, 04:40 PM Post #27 |
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can you post a pic of your cam to crank timing gear. try to include the complete gears. sometimes I have seen experienced mechanics swear by their timing and even after they checked them (the same way each time) I have found the timing to be off. Sure would like to see a pic of your timing belt & gearing complete. |
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| Frozen_Joker | Oct 27 2013, 04:45 PM Post #28 |
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Elite Member
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That would require removing several things and lifted the motor high enough to get the shot. I left the time cover off for the time being so I didn't have to remove 20 parts just to retime. I have the cam gear set at this http://geometroforum.com/single/?p=295571&t=3519698, and the crank gear set at this http://ecomodder.com/forum/showthread.php/how-advance-timing-12617.html with the number one piston at the top of its compression. Scroll down to see the crank pic, that is where mine is at. |
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| PTA2PTB | Oct 27 2013, 04:47 PM Post #29 |
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I'm totally awesome! I swear.
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If it were mine, as an absolute last resort, before doing something more drastic, like tearing the head back off, I would: pull the timing belt off remove the valve cover rotate the camshaft so the lobes are pointing away from the intake and exhaust valve rockers test the compression on that cylinder If it comes way up, you have a timing issue, involving the orientation of your belt on your camshaft relative to your crankshaft. If your compression reading stays the same for that cylinder as your previous test, then back way off the lash adjustment screw on both valves, so that there's absolutely, positively, no pressure on the valve stems by the rockers, and do the compression test again. If it still doesn't come up, then you have SERIOUS problem, somewhere. You probably will have to tear the head back off and investigate, if that turns out to be the case. |
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| Frozen_Joker | Oct 27 2013, 04:50 PM Post #30 |
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Elite Member
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I am tempted to do that anyway cause I am none to happy looking down into the oil galleys and seeing such a itty bitty hole. I will try timing it and re-torquing the rocker arms back down again. If I still have no luck, I am gonna start pointing my finger at the odd looking head gasket. Once it is timed again I will take a couple new pics of where I have it timed at and upload them. But I think for today, I am calling it a quits. This car is getting under my skin today. Lol.
Edited by Frozen_Joker, Oct 27 2013, 04:53 PM.
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PTA2PTB is banished back to the humor department. No distributor on a G13BB engine.
Oops, I guess I got my wires a little crossed there, and forgot what type of engine were were talking about. *PTA2PTB recoils at the thoughts of having distributed misinformation*
2:16 PM Jul 11