SoCaLKiDz Posted June 2, 2011 Report Share Posted June 2, 2011 Well i was crusin the 720 next to my buddies 325i when we got to a jack in the box to eat. We were there for maybe twenty minutes eating inside. After we are done eating he pulls around into a gas stall. (Yes its a gas station and Jack in the box.) So i pull in next to him and as i stop a huge puff of white smoke comes poring out.. I ask him if that was my truck and he says yes. So i check oil and coolant and there fine. So i say lets head back the the house and see whats going on. As we are driving back i see not one hint of smoke.Get to my house and know smoking. Turn the truck off and wait. Five minutes later start it up and it smokes again. So i go for a drive and it stops smoking. Point is it only smokes when i start it anyone have any idea? 81 napz2.2 720 2wd Quote Link to comment
68Datsun510 Posted June 2, 2011 Report Share Posted June 2, 2011 What does the smoke smell like? Quote Link to comment
Guest DatsuNoob Posted June 2, 2011 Report Share Posted June 2, 2011 What does the smoke smell like? Labrador Quote Link to comment
john510 Posted June 2, 2011 Report Share Posted June 2, 2011 White smoke ? maybe water. Quote Link to comment
Skib Posted June 2, 2011 Report Share Posted June 2, 2011 if its blue and happening when you fire it up most likely your valve stem seals. they get dry and brittle. if its white and smells sweet its coolant, if so check your dip stick and under side of your oil cap, make sure it dont look like a grey milk shake. Quote Link to comment
metalmonkey47 Posted June 2, 2011 Report Share Posted June 2, 2011 I had this problem once. I was coming through the twisties, and when I came off the gas, I saw a big huge puff of smoke. Kinda funny honestly :rofl: Quote Link to comment
Stfwells Posted June 2, 2011 Report Share Posted June 2, 2011 if its white and smells sweet its coolant, if so check your dip stick and under side of your oil cap, make sure it dont look like a grey milk shake. Sounds like a recipe for a pain in the ass...:( Quote Link to comment
Gary Posted June 2, 2011 Report Share Posted June 2, 2011 sounds like valve stem seals :( on the upside, theyre not hard to do if you use rope in the cylinder to hold the valves up (or those air fittings if you've got a reliable compressor) Quote Link to comment
datzenmike Posted June 2, 2011 Report Share Posted June 2, 2011 Turn the truck off and wait. Five minutes later start it up and it smokes again. So i go for a drive and it stops smoking. Point is it only smokes when i start it anyone have any idea? 81 napz2.2 720 2wd When shut off, oil runs down the exhaust valves past worn seals. (can do this on the intakes as well) When you start up, the oil is burnt off in a puff of BLUE smoke. When running, exhaust pressure prevents the oil from getting past the seals. A head gasket that is bad or heading that way will also seep a small amount of water into the cylinder that will flash into WHITE steam on start-up. When running, compression keeps the water pushed out. In both cases it doesn't take much to make a large cloud of smoke or steam. A rad or oil check may not show enough loss to notice. A small water leak may not show up on a compression check either. You say white cloud so I would suspect a water leak. This would be the head gasket and you can do three things. Change it and everything should be fine, in which case you can assume it was a gasket. Leave it until it blows completely and you know for sure. (but it picks te time and place to do this) Or you can re-torque the head bolts and this may stop the problem. The Z24 is notorious for blowing head gaskets ad Nissan recomends head bolt retorquing at every tune up to prevent this. I don't think the Z22 is this bad butit never hurts as all gaskets are subjected to a shearing action from the different heat expansion rates of the aluminum head against the cast iron block. The gasket also compresses over time and is subjected to thousands and thousands of warm up and cool down cycles. The procedure is: ON A COLD MOTOR fully loosen each head bolt and torque to spec, about 60 ft lbs. You can do in any order but you must only loosen and tighten them ONE AT A TIME. Quote Link to comment
SoCaLKiDz Posted June 2, 2011 Author Report Share Posted June 2, 2011 So should in replace the head gasket or just tighten the head bolts? As for everything else it's fine. Coolant is still good, oil is brand new new oil filter. And I am pretty sure the valves at loose. Maybe the loose valves at causing it? Quote Link to comment
ggzilla Posted June 2, 2011 Report Share Posted June 2, 2011 Loose valve wont cause it. Vavle seal do. Just torque the head, you supposed to dp it every 12 months. But that wont stop the smoke from the valve seals Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.