Dans240z Posted October 29, 2004 Share #1 Posted October 29, 2004 I am buying a 1973 240z. The guy who is selling it to me has done lots of modifications to the car, L28 engine with flat top pistons, ZX 5 speed, Tripple Webbers, among others. The car comes with lots of parts including an n42 head complete and ready to go. The current head is from a maxima and i am told that it has a really bad cam. Like one of the lobes are messed up. I want to put on the n42 before I start the motor. When I put on the n42, what precautions should I take? I have a few books, but are there any tricks or tips that I should know? Help would be greatDan Wetmore Link to comment https://www.classiczcars.com/topic/13832-head-change-n42/ Share on other sites More sharing options...
240ZX Posted October 29, 2004 Share #2 Posted October 29, 2004 Just follow the standard practices for installing a head. Do you own a repair manual and a torque wrench? Remember that good preparation and attention to details are always crucial to success. If by chance you've never done this before, get someone who has to assist you. Link to comment https://www.classiczcars.com/topic/13832-head-change-n42/#findComment-100025 Share on other sites More sharing options...
Ed Posted October 29, 2004 Share #3 Posted October 29, 2004 Congrats on finding a Zed! Lets see some pictures . I'm not sure I've ever heard of a Maxima head fitting a L28, maybe the older Maxima's??? Installing a new head is no easy task. You must have the proper tools and follow certain procedures. Read your manual twice, and follow it to the letter!Invest in a timing chain tensioner holder from MSA. What work was done to the N42 head? Link to comment https://www.classiczcars.com/topic/13832-head-change-n42/#findComment-100057 Share on other sites More sharing options...
Dans240z Posted October 30, 2004 Author Share #4 Posted October 30, 2004 The whole head was reconditioned. The valves were reseated and nismo exhaust valves were installed. He also installed a robello (is that correct?) cam.Besides the head gasket, will i need any other new parts?Thanks,Dan Link to comment https://www.classiczcars.com/topic/13832-head-change-n42/#findComment-100068 Share on other sites More sharing options...
beandip Posted October 30, 2004 Share #5 Posted October 30, 2004 I cant think of anything since the head is freshly rebuilt. Do as Ed said invest in a cam chain holder . Other wise you will be removing the front of the engine puting things right when the tensioner slips the chain. Congrats on finding the Z all the best . Gary Link to comment https://www.classiczcars.com/topic/13832-head-change-n42/#findComment-100076 Share on other sites More sharing options...
280zgod Posted October 30, 2004 Share #6 Posted October 30, 2004 the early 80's maximas had L24's in them so im guessing it was one of the heads from that era maxima Link to comment https://www.classiczcars.com/topic/13832-head-change-n42/#findComment-100081 Share on other sites More sharing options...
Ed Posted October 30, 2004 Share #7 Posted October 30, 2004 Besides the head gasket, will i need any other new parts? Thanks, Dan IF everything goes well and you don't have any problems (big IF) besides the head gasket you will also need a new intake / exhaust gasket, valve cover gasket and the gaskets that go around the thermostat housing. You might also want to replace some of the fuel lines while you have them off. You will also need fresh coolant. If everything goes as to be expected from a 30 year old. Then including the parts already mentioned you will also need; some asprin, band-aid's, a broken bolt extractor, and the front cover gaskets. Good luck, let us know how it goes. Link to comment https://www.classiczcars.com/topic/13832-head-change-n42/#findComment-100100 Share on other sites More sharing options...
Dans240z Posted October 30, 2004 Author Share #8 Posted October 30, 2004 Thanks for the help. The car I am getting does not run, and it needs quite a bit of work. There is little rust on the car though, my main reason for getting it. Its going to be alot of work for me, but I really love these cars. I will be buying the gaskets this week, as I will be getting the car on November 7th. Thanks,DanPs: How do you post pictures? :stupid: Link to comment https://www.classiczcars.com/topic/13832-head-change-n42/#findComment-100143 Share on other sites More sharing options...
Patcon
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