Omar Posted October 10, 2007 Share Posted October 10, 2007 so i have a 240Z with an l28et. the motor is pretty much stock just intake and exhaust. it used to go 3/4 of the way to hot on the temp sensor when i was pushing on it alot. one time it got to the H when i was really beating on it on the highway. since then every time i drove it it get about 5/6 of the way to H but never more. And it bubbles into the overflow after i turn the car off. and now it happens with just normal driving after about 8 minutes. but it will idle forever and not get past half. i did a leak down test at about 60psi and detecting nothing as far as a bad HG or warped head. there is no burning of coolant and nothing leaking. I also took out the thermostat, just to get rid of that variable. and it didn't help. any suggestions.........please? Quote Link to comment Share on other sites More sharing options...
GeeZ Posted October 10, 2007 Share Posted October 10, 2007 Send to radiator shop have it rodded out and cleaned. Quote Link to comment Share on other sites More sharing options...
Omar Posted October 10, 2007 Author Share Posted October 10, 2007 you mean send the radiator to be cleaned? Quote Link to comment Share on other sites More sharing options...
Sideways Posted October 13, 2007 Share Posted October 13, 2007 Pretty much. Quote Link to comment Share on other sites More sharing options...
24ounce Posted October 15, 2007 Share Posted October 15, 2007 i had a normal 280zx do that once got hot once then would always run hot - turns out the head was warped/cracked Quote Link to comment Share on other sites More sharing options...
Omar Posted October 24, 2007 Author Share Posted October 24, 2007 ya, so im about to change the HG now. i want a DIY guide on the HG but idk if there is none then o well. i just want it for the technical crap like timing and tdc marks that i cant find hehe. Quote Link to comment Share on other sites More sharing options...
mario_82_ZXT Posted October 24, 2007 Share Posted October 24, 2007 Only timing you need to worry about if you don't mess with anything is cam timing. Just scratch a place between two circles on the gear, then mark the two links that go to the left and right of that scratch. I've done it this way twice. Makes for a headgasket job in less then 2.5hrs. Mario Quote Link to comment Share on other sites More sharing options...
Omar Posted October 24, 2007 Author Share Posted October 24, 2007 ya but i want to make sure the last time the HG was done the timing was set correctly. thats y i need to get the motor to TDC but idk which marking to go by. Quote Link to comment Share on other sites More sharing options...
naviathan Posted October 24, 2007 Share Posted October 24, 2007 Go by the piston position. If number 1 is up and the intake and exhaust valves are closed then you're at TDC. I got lucky because my crank mark is still accurate (of course I checked to make sure).I just spin the motor until the cam number 1 and 2 lobes are up the timing mark lines up at 0 on the plate. The only time I had a problem was when I replaced the oil pump and didn't prime it before cranking. No oil pressure puts no pressure on the chain tensioner which allowed the chain to skip. Of course I didn't realize this until I found the eye brows in the pistons from the exhust valves. Quote Link to comment Share on other sites More sharing options...
TimZ Posted October 24, 2007 Share Posted October 24, 2007 ...So did I miss something? How come you are jumping straight to 'replace the head gasket' for this problem? That's a pretty major chunk of work if you haven't isolated the problem yet. If you are going to 'shotgun', start with the easy stuff first. Quote Link to comment Share on other sites More sharing options...
Omar Posted October 25, 2007 Author Share Posted October 25, 2007 The only time I had a problem was when I replaced the oil pump and didn't prime it before cranking. No oil pressure puts no pressure on the chain tensioner which allowed the chain to skip. well if i open the radiator cap and i quickly tap the gas, bubbles come out of the radiator, thats a bhg as far as i know. how do u prime it first?? Quote Link to comment Share on other sites More sharing options...
Omar Posted November 8, 2007 Author Share Posted November 8, 2007 never mind Quote Link to comment Share on other sites More sharing options...
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