sone Posted December 8, 2008 Share Posted December 8, 2008 after taking a little look and cleaning out the crank shaft of my 1977 280z my mechanic showed me the crank shaft bearings were good but were a little worn down, he pulled out 2 and showed how'd the (inner half pipe looking) side looked like it was sanded down a little on the edges, its not a job i was planning to do anytime soon but wanted to know who was selling these things and how much? i might end up doing it mid 09 but im trying to stay focused on the necessities first, thanks to JSM i should be able to check anpther part off my z wishlist. anywho... they look kind of like the ones on #3 in this picture squared on one side with a half moon cut on the other. http://www.atlanticz.ca/zclub/techtips/explodedviews/280z/77fsm/main%20bearings.gif Quote Link to comment Share on other sites More sharing options...
sone Posted December 8, 2008 Author Share Posted December 8, 2008 oh and of course thanks for the replies in advance! Quote Link to comment Share on other sites More sharing options...
Xnke Posted December 8, 2008 Share Posted December 8, 2008 You can get them at autozone, kragen, wherever...those are the main bearings, and they come as a set. Quote Link to comment Share on other sites More sharing options...
sone Posted December 9, 2008 Author Share Posted December 9, 2008 Yeah The Main Bearings Are Easy To Find But What I Meant Were The Pieces At The Bottom Of The Picture, To Be More Specific, The Big Block Of Aluminum Where The Main Bearings Go Flush Inside. (in Other Words The First Piece Right Over The Number 3) Lol. Thanks Again. Quote Link to comment Share on other sites More sharing options...
Administrators RTz Posted December 9, 2008 Administrators Share Posted December 9, 2008 Yeah The Main Bearings Are Easy To Find But What I Meant Were The Pieces At The Bottom Of The Picture, To Be More Specific, The Big Block Of Aluminum Where The Main Bearings Go Flush Inside. (in Other Words The First Piece Right Over The Number 3) Lol. Thanks Again. That's not aluminum... its iron, and its called a "main cap". You're saying you wore into a main cap? Quote Link to comment Share on other sites More sharing options...
Administrators BRAAP Posted December 9, 2008 Administrators Share Posted December 9, 2008 For what it's worth, you should be able to find a good running replacement L-6 for less $$$.$$ than it will cost to rebuild one. Quote Link to comment Share on other sites More sharing options...
woldson Posted December 9, 2008 Share Posted December 9, 2008 Curious: How could of this occurred? ESP if the baring had little ware? Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted December 9, 2008 Share Posted December 9, 2008 Most likely it didn't happen. The mechanic is trying to take advantage of this person IMO. Quote Link to comment Share on other sites More sharing options...
naviathan Posted December 9, 2008 Share Posted December 9, 2008 I have to ask the same question...If the bearings were in how did you wear into the caps? Why do you need to replace them? While I'm at it, why do they call the thin steel inserts bearings when they seem to be more of a bushing? Just a thought... Quote Link to comment Share on other sites More sharing options...
blue72 Posted December 9, 2008 Share Posted December 9, 2008 Yeah, the inner surface of the main caps isn't a mirror finish. I can't see any way for the main bearings themselves to wiggle about much because they are keyed on one end to prevent movement and torqued down at the same time. You'd probably have to show us some pictures of the "wear" for us to see what you're talking about. Quote Link to comment Share on other sites More sharing options...
2eighTZ4me Posted December 9, 2008 Share Posted December 9, 2008 If you wore down to a main cap, you would have more than likely spun a bearing inside the main cap and screwed it up that way. If a bearing is good, it should protect the main cap - unless of course, you spun the bearing and the crank and main cap started making friends. You'd hear that as an obnoxious knocking noise when the car was running. I'm with Paul - you can get a used motor/bottom end cheaper than rebuilding the one you have. I used genuine Nissan bearings, and those alone for rods and mains were $150. Quote Link to comment Share on other sites More sharing options...
Chaparral2f Posted December 9, 2008 Share Posted December 9, 2008 I don't know squat about nissan engines, but it seems to me that the only way it would be possible to get wear on the sides of the main caps would be to grind through the thickness of the thrust face on the number four main bearing( in the illustration.) If that were to happen, the flywheel would take out the rear main seal, or the harmonic balancer would destroy the seal in the front and the engine would, at best, leak oil faster than it could be poured in. Either way, the bearings would be more than a "little worn down". IMHO. The mechanic is trying to stick you for a major repair. Just mic the crank and install new bearings. Quote Link to comment Share on other sites More sharing options...
JSM Posted December 9, 2008 Share Posted December 9, 2008 Sone I shipped the part today. If my current buyer falls through I do have a very nice L28 motor I would sell for $250.00. Here is the link w/ the info about the motor: http://forums.hybridz.org/showthread.php?t=140023 Quote Link to comment Share on other sites More sharing options...
sone Posted December 10, 2008 Author Share Posted December 10, 2008 whoa you guys are scarring me here, i see what you mean about the bearing protecting that side of the cap, and now im questioning why he never mentioned the actual bearing being there, he showed me main cap (in which i made the mistake of calling a bearing) but he never showed or even mentioned the actual bearings. im going to have to go see it again and take pictures, thanks for the replies btw- the onyl noise i had was the cracked first header that made a irregular bursts , but i never heard that knocking noise so i doubt i spun a bearing. I LOVE THIS FORUM! lol Quote Link to comment Share on other sites More sharing options...
woldson Posted December 10, 2008 Share Posted December 10, 2008 Looking forward to the pics! Quote Link to comment Share on other sites More sharing options...
jc052685 Posted December 14, 2008 Share Posted December 14, 2008 where are those pics???? Quote Link to comment Share on other sites More sharing options...
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