jacobryandavidson Posted October 14, 2013 Report Share Posted October 14, 2013 Didnt get hot over revved motor busted head now milkshake New to site just seeing who all will chime in thanks Quote Link to comment
Z-train Posted October 14, 2013 Report Share Posted October 14, 2013 Head gaskets don't pop from over-revving. Quote Link to comment
jacobryandavidson Posted October 14, 2013 Author Report Share Posted October 14, 2013 Who said the head gasket blew ... Dont most ppl replace gasket when u change head .... And i asked for tips not mechanics lesson i already have the head off it has a giant hole in water jacket and a melted exhaust valve just seeing if anyone had any miracle cure to the head gasket issues these have Quote Link to comment
jacobryandavidson Posted October 14, 2013 Author Report Share Posted October 14, 2013 I wasn't tryna be rude just frustrated with this truck Quote Link to comment
datzenmike Posted October 14, 2013 Report Share Posted October 14, 2013 Who said the head gasket blew ... And i asked for tips not mechanics lesson... Over to you Bill... just seeing if anyone had any miracle cure to the head gasket issues these have The Z24 was known for blowing head gaskets at 100K. This was from the normal disparity of heat expansion of aluminum head and steel block de-laminating the gasket and made worse by poor.... maybe I'm straying over into a mechanic's lesson, so I'll stop here. The preventative cure was described in the '84 Nissan FSM. The head bolts should be loosened fully and immediately torqued to 60 ft. lbs. The bolts MUST only be done one at a time and the motor MUST be cold. It was suggested the head bolts be re-torqued at every tune up. Burnt valve is usually from too little or no valve clearance. Valves tent to sink into the head as they wear and clearances should be checked every tune up. Quote Link to comment
jacobryandavidson Posted October 14, 2013 Author Report Share Posted October 14, 2013 Ya had a burnt valve for a while now i think the heat is what weakened my head because the hole is right above valve underneath cam and datzenmike i ment no offense with the mechanic comment i just beleive his reply wasnt what i was looking for ... I am by no means a master mechanic more like shade tree Quote Link to comment
datzenmike Posted October 14, 2013 Report Share Posted October 14, 2013 Hell I'm not offended. I was waiting for Bill to blow up... :lol: :lol: (sorry bill but it's true) :lol: :lol: :lol: (so true) Quote Link to comment
EricJB Posted October 14, 2013 Report Share Posted October 14, 2013 Post up a pic. If it melted a hole in the combustion chamber, it is probably from leaning out. Most likely not related to the valve. The exhaust valves only time it doesn't have hot exhaust blasting past it , is when it is on the seat. That is its cool down time. the tighter the lash, the shorter the time. Quote Link to comment
Z-train Posted October 14, 2013 Report Share Posted October 14, 2013 Speed reading...got me.oops.Sorry to disappoint Mike.Back to topic,still more issues than engine speed. 1 Quote Link to comment
EricJB Posted October 14, 2013 Report Share Posted October 14, 2013 Didnt get hot over revved motor busted head now milkshake New to site just seeing who all will chime in thanks That's a lot to speed read in one sentence . Quote Link to comment
datzenmike Posted October 14, 2013 Report Share Posted October 14, 2013 Speed reading...got me.oops.Sorry to disappoint Mike.Back to topic,still more issues than engine speed. . :) What came first, chicken or the egg? Valve clearance is tight or non existent, valve overheats and burns, seat collapses hole burns through head. Quote Link to comment
HRH Posted October 14, 2013 Report Share Posted October 14, 2013 The head hole is usual. The gasket between 3 and 4 gives out, the exhaust gases swap in those cylinders and in no short order it melts an escape path. Have a head shop weld it up and plane it, good as new usually. Your local NAPA can get you a new set of head bolts, use them. Chase all the block holes with a tap first before reassembly. Quote Link to comment
jacobryandavidson Posted October 14, 2013 Author Report Share Posted October 14, 2013 Lol :) how do i post a pic ???? Im goin to pick n pull now to get another head Quote Link to comment
jacobryandavidson Posted October 14, 2013 Author Report Share Posted October 14, 2013 Its an actual hole though.... Like cam lobe hit it almost ... Itd take a good welder but i guess it could be fixed Quote Link to comment
datzenmike Posted October 14, 2013 Report Share Posted October 14, 2013 If looking for another head be sure it's not from a 720 with a Z20 engine. Best fit is another Z24. The Z24 was also used in the '86-'89 D-21 Hardbody.and Pathfinder Quote Link to comment
jacobryandavidson Posted October 14, 2013 Author Report Share Posted October 14, 2013 Thanks bud thats the ? I was about to ask cant find one anywhere guess ill head around to suvs and look for a old pathfinder Quote Link to comment
datzenmike Posted October 14, 2013 Report Share Posted October 14, 2013 720s are older but mostly Z motors. I've never seen a Pathfinder with a 4 cylinder motor. Rare as rocking horse shit... toooo heavy for them. D-21s are more likely. Quote Link to comment
HRH Posted October 14, 2013 Report Share Posted October 14, 2013 Actually, I've seen a bunch up here. Stripped down models, usually only the 2 door early Pathys. They still have the H190 in the rear too. And get this, I started looking for Pathfinders recently, I've already found 3 2wd ones up here in Spokane/CDA. Yes, that's right, 2wd Pathfinder. I can't imagine why anyone would get a 2wd pathy, but apparently some did. I was actually thinking about getting one of those and putting my truck body on it for autocrossing. Thought about autocrossing the 2wd Pathy too, but all the extra doors and hatch make for too much weight. Quote Link to comment
Stoffregen Motorsports Posted October 14, 2013 Report Share Posted October 14, 2013 The hole in the head is in the top of the head? Or on the gasket surface or in the combustion chamber? Doubtful a cam lobe could hit the head. Are all the valves in tact? Any keepers or retainers missing off the the valve springs? Does the hole look burnt or made by flame? Quote Link to comment
jacobryandavidson Posted October 14, 2013 Author Report Share Posted October 14, 2013 Pics how do i do lol Quote Link to comment
datzenmike Posted October 14, 2013 Report Share Posted October 14, 2013 http://community.ratsun.net/topic/691-how-to-post-pictures-and-keep-online-photo-albums/ Basically you post your pictures somewhere that will host them like Photobucket. You can then copy the stored picture info and post it here. Quote Link to comment
Stoffregen Motorsports Posted October 14, 2013 Report Share Posted October 14, 2013 Photobucket. Cut IMG code and paste in your reply. Quote Link to comment
jacobryandavidson Posted October 14, 2013 Author Report Share Posted October 14, 2013 http://i971.photobucket.com/albums/ae198/jacobryandavidson/CAM01590_zps0a4d0182.jpg Quote Link to comment
datzenmike Posted October 14, 2013 Report Share Posted October 14, 2013 Just to the left and below the smiley face. Click the small green square and past the image there and it come up. Quote Link to comment
jacobryandavidson Posted October 14, 2013 Author Report Share Posted October 14, 2013 ? Quote Link to comment
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