Cessna Posted June 2, 2009 Share #1 Posted June 2, 2009 Ok went to change thermostate and snapped off one bolt, after soaking with PB for 10 days.? i have is what size is the bolts?Is there a list of bolt specs for the 72-240Z?What are all the abbreviations being used on the forum?Thxs in advance,Joel Link to comment Share on other sites More sharing options...
Z train Posted June 2, 2009 Share #2 Posted June 2, 2009 Those bolts are the same for all L-series motors. Link to comment Share on other sites More sharing options...
Diseazd Posted June 2, 2009 Share #3 Posted June 2, 2009 Motorsports sells the bolt kit for the thermostat housing. Link to comment Share on other sites More sharing options...
Walter Moore Posted June 3, 2009 Share #4 Posted June 3, 2009 My thermostat bolts snapped off as well. I tried using an easy-out, but broke it off as well. I ended up having to VERY CAREFULLY drill out the bolt.A harrowing thing too, drilling a steel bolt out of an aluminum housing... I just keep drilling into it with ever larger drills until the bolt literally unpeeled from the housing. One mistake and you will need a new housing.At least I think they are still available if you mess it up. Link to comment Share on other sites More sharing options...
srbigbutt Posted June 3, 2009 Share #5 Posted June 3, 2009 When I got my car it was missing a thermostat bolt. Don't know how long it was like that. But I put a new bolt on. Don't remember what size. I think it was just a 10mm bolt. Link to comment Share on other sites More sharing options...
Inf Posted June 3, 2009 Share #6 Posted June 3, 2009 Yeah, I had this problem years ago when I first got my car. Do yourself a favor and get some high grade stainless bolts and apply anti-seize like there's no tomorrow. Link to comment Share on other sites More sharing options...
WingZr0 Posted June 3, 2009 Share #7 Posted June 3, 2009 Motorsports sells the bolt kit for the thermostat housing.I used the MSA ones and they worked out fine, they're on the cylinder head now. Dont know how long untill they go bad though like the old ones did when those snaped off too on my '77. Didn't know it was a common problem. ~Z~ Link to comment Share on other sites More sharing options...
DatsunZsRule Posted June 4, 2009 Share #8 Posted June 4, 2009 Just what I want to hear when I plan to do my water pump in the near future. I have a friend I know very well who has his own shop that he runs and has a real nice facility with more high end equipment than I do at my house. I'm kicking the idea around to just outsource this particular job to him being that mine has the orig. 32 yr. old parts, I can just see those damn bolts going "SNAP" on me :paranoid: I wish I had time to do it where I work but hell I'm lucky if I get a lunch break sometimes I'm so busy with customer stuff. Link to comment Share on other sites More sharing options...
rtaylor Posted June 4, 2009 Share #9 Posted June 4, 2009 Water pump bolts are another thing entirely different from the thermostat housing bolts. It is hell having one snap off. If I had it to do over again, I would have outsourced the job knowing one or two would snap off in the block and the chore, and I mean CHORE, would become someone else's responsibility. I broke easy outs in the block and it took many hours to drill it out and I wound up having to use a helicoil. Link to comment Share on other sites More sharing options...
WingZr0 Posted June 4, 2009 Share #10 Posted June 4, 2009 Just what I want to hear when I plan to do my water pump in the near future. I have a friend I know very well who has his own shop that he runs and has a real nice facility with more high end equipment than I do at my house. I'm kicking the idea around to just outsource this particular job to him being that mine has the orig. 32 yr. old parts, I can just see those damn bolts going "SNAP" on me :paranoid: I wish I had time to do it where I work but hell I'm lucky if I get a lunch break sometimes I'm so busy with customer stuff. Water pump bolts are another thing entirely different from the thermostat housing bolts. It is hell having one snap off. If I had it to do over again, I would have outsourced the job knowing one or two would snap off in the block and the chore, and I mean CHORE, would become someone else's responsibility. I broke easy outs in the block and it took many hours to drill it out and I wound up having to use a helicoil. Yeah, I bassicaly had to buy NOS lower and upper thermostat housing parts and the bolts. The bolts that broke were in the lower housing. Figured why drill when I can just replace the whole thing since the lower housing to cylinder head bolts didn't brake off. Easy job for me , though cost me 100 bucks ~Z~ Link to comment Share on other sites More sharing options...
DatsunZsRule Posted June 5, 2009 Share #11 Posted June 5, 2009 (edited) Yeah, I bassicaly had to buy NOS lower and upper thermostat housing parts and the bolts. The bolts that broke were in the lower housing. Figured why drill when I can just replace the whole thing since the lower housing to cylinder head bolts didn't brake off. Easy job for me , though cost me 100 bucks ~Z~ Like me and rtaylor were saying though, having a bolt or bolts snap off for the water pump is a different story. Trying to deal with a problem like that out of your home garage where your equipment is limited and your busy working everyday of the week at your job, it just turns into a major nightmare and not really worth the hassel. My two cents. Edited June 5, 2009 by DatsunZsRule Link to comment Share on other sites More sharing options...
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