ggzilla Posted August 9, 2012 Report Share Posted August 9, 2012 PCV system not hooked up doesn't mean the engine is bad ... not sure how you drew that conclusion. Quote Link to comment
72240z Posted August 9, 2012 Report Share Posted August 9, 2012 PCV system not hooked up doesn't mean the engine is bad ... not sure how you drew that conclusion. Ignorance and a keyboard is how lol Quote Link to comment
banzai510(hainz) Posted August 9, 2012 Report Share Posted August 9, 2012 Personally I would just pull the crank case vent tube hose to atmosphere(open) and see if the MOFO sticks at idle) or shine a flashlight at night and youll see the smoke if its that bad. My thailand rebuilt L18 had this. At night I could see smoke rise from the hood if car shined their light just right across the hood. Tore apart the motor the ring all had the same ridge line on all the bores in the same spot like the gap was wrong and wore a UP/Down spot. all cylinders. I had sidedraft Mikunis on there so thats why i notice the stink and smoke. If stock set up Im sure I wouldnt have notice as much except oil consumption Quote Link to comment
Z-train Posted August 9, 2012 Report Share Posted August 9, 2012 The FSM states that 154 is out of spec. Quote Link to comment
HudsonMC Posted August 9, 2012 Report Share Posted August 9, 2012 The FSM states that 154 is out of spec. What he's saying is that unless the guage is calibrated, a 154 reading on that gauge may not ACTUALLY BE 154 psi. If all four cylinders are at 154, it's way more likely that the gauge is reading wrong and the engine is good. What are the chances that all four cylinders are bad and failed in the same way to give the exact same compression reading? Quote Link to comment
DanielC Posted August 9, 2012 Report Share Posted August 9, 2012 This is a picture of me doing a compression test on an L-16 engine. If you have a engine only, it will be more difficult to do it, because the starter bolts to the transmission. As far as the actual numbers go, at or slightly below, or slightly higher than the actual numbers given in the service manual for a low minimum, means the engine is still worn, and it can be improved. An engine with compression numbers close to the high number will run better than one close to the low numbers. It will also get better gas mileage, and have more power. It will also burn less oil. In My L-16 service manual, if has the compression numbers and a cranking speed of 350 RPM. I do not have a tachometer that reads that low. So, if your compression gauge is slightly off, it does not matter. Quote Link to comment
Z-train Posted August 9, 2012 Report Share Posted August 9, 2012 What he's saying is that unless the guage is calibrated, a 154 reading on that gauge may not ACTUALLY BE 154 psi. If all four cylinders are at 154, it's way more likely that the gauge is reading wrong and the engine is good. What are the chances that all four cylinders are bad and failed in the same way to give the exact same compression reading? O.K.-but my comments were/are based on accurate info being related. Quote Link to comment
72240z Posted August 9, 2012 Report Share Posted August 9, 2012 Whats the point of going back and forth over this. I still havent seen a post from him showing the results of all the testing from the advice given already lol. Quote Link to comment
king bee66 Posted August 10, 2012 Report Share Posted August 10, 2012 i didnt say the pcv being disconnected meant the motor was bad, but wouldnt oil escape through the hose if its not connected? i know that my pcv valve had broken open once and the hose was spitting oil right into my manifold. i dont know... im more than willing to accept im wrong. Quote Link to comment
datzenmike Posted August 10, 2012 Report Share Posted August 10, 2012 If you're loosing a pint of oil in 30 minutes of run time, that's a SERIOUS amount of oil...if you were burning all of it then you'd be doing a public service by killing ALL the mosquitos in the neighborhood as you drove through. That'd be a FUCKLOAD of oil smoke. If the hose is off the oil must be spraying out and you'd see it dripping off everything If there are no leaks then you definitely would see the smoke. If not burning it or spraying/leaking then where else can it be going?? Quote Link to comment
ggzilla Posted August 10, 2012 Report Share Posted August 10, 2012 A lot of people don't notice the smoke even when looking for it in the rearview mirror. A better test is have someone follow you and look. Or do the smoke tests. Or the wet compression test. Or keep guessing and applying bench logic ... Quote Link to comment
ggzilla Posted August 10, 2012 Report Share Posted August 10, 2012 oil escape through the hose if its not connected?Maybe not, the factory put a baffle and arrestor in the hose. They put better baffles in the later L-series to prevent oil coming out. Quote Link to comment
MantisX620 Posted August 23, 2012 Author Report Share Posted August 23, 2012 So I installed my new engine and now it runs like Jamaica! Ill be taking my old engine and trying my hand at my first rebuild. My new engine is now leaking pretty bad from the valve cover. I bought a new gasket from rockauto but I cant seem to get it to seal very well. Is it recommended to use permatex on the valve cover gasket or do I need to start over with another new gasket/retorque? Thanks MantisX Quote Link to comment
72240z Posted August 23, 2012 Report Share Posted August 23, 2012 Some use permatex, use the indian head if you do. Make sure you tq to spec in an outward spiral starting at the center just like a head. 1 Quote Link to comment
MantisX620 Posted August 23, 2012 Author Report Share Posted August 23, 2012 Cool, will give it a go tomorrow! Feels good having my slow but reliable 620 going again. The valve cover is a walk in the park compared to what I went through replacing the engine LOL Thanks again Ratsun MantisX Quote Link to comment
datzenmike Posted August 23, 2012 Report Share Posted August 23, 2012 You shouldn't need any sealer. Nissan didn't use it. That shit will squeeze out on the inside and end up stuck to the screen on the oil pick up pipe. Also good luck getting it off next time you adjust the valves. Most of all you don't want your Datsun engine looking like a Chevy 305. 1 Quote Link to comment
I'm BLUE Posted August 23, 2012 Report Share Posted August 23, 2012 Most of all you don't want your Datsun engine looking like a Chevy 305. Oh thank gawd you said chevy 305. Because if you said chevy 350 thems fightin words ,,, :lol: ,,,, completely different engine and owners ,,, :lol: jk bro. Quote Link to comment
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