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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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05-09-2007, 01:38 PM | #1 |
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Installing Rod Bearings/Main Bearings
Exactly how hard would it be for a first time engine builder to install rod bearings and main bearings on a completely new bottom end, with new pistons/rod/crank....
this would be my first engine build but i have swapped engines before and just bolt on's and stuff...do you think it would be possible for me to do it myself or not? things i would need to buy and install would be Headgasket , Crank , Rods , Pistons , Bearings , Headstuds. |
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05-09-2007, 01:41 PM | #2 | |
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05-09-2007, 01:41 PM | #3 |
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its pretty simple not that hard your first its just that its gonna take you a bit longer. once you get use to the building its seems faster than the first time. just make sure you dont take short cuts. short cuts can be devastating to your build.
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05-09-2007, 02:00 PM | #4 |
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good information...i really want to make it into a learning experience and also the fact that shops are saying its close to 800$ and im better off buying a short block or longblock and going from there... for 800 i can get a decent build....
i have alot of wrenching experience but just not engine builds...which i know is different from just pulling plugs and hoses... |
05-09-2007, 02:01 PM | #5 |
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what short cuts?
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05-09-2007, 02:02 PM | #6 |
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05-09-2007, 04:23 PM | #8 |
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This might help you... I just finished up rebuilding my first motor...
I am going to update the post in the next day or two with the final pictures from the rebuild... http://forums.freshalloy.com/showthread.php?t=143200 |
05-09-2007, 05:52 PM | #11 |
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Typically a machine shop does that for you, but its essentially sizing your bearings for crank/rods.
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05-09-2007, 06:39 PM | #12 |
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05-09-2007, 07:34 PM | #14 |
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If you want to understand the machining process and the engine building process a good book for you is "Sunnen's Complete cylinder head and engine rebuilding handbook". It's alot of V8 stuff but you can take that and a FSM and see what you need to do. If you read that book and still don't understand you should probably let a shop do it.
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05-09-2007, 07:57 PM | #15 |
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If you really want to do it yourself I would suggest finding someone who has done it before and knows what they are doing and invite them to help you with maybe some beer or money. Probly not something your going to want to do alone if you have never done it and based on the questions you are asking.
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05-09-2007, 08:19 PM | #16 |
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Just read the FSM. Slowly. Print it out, have it infront of you. Check off each step. The chiltons guide for the Sentra SR has some good hints in it too.
As far as sizing the bearings, there is two different ways to go about it: Trail and Error Via Plastiguage. You will need to order more bearing than you are using as you are sizing/resizing like this. Plastiguage is also NOT an exact science. Having a machine shop spec the crank profile and main/rod ends is a good start. Most of the time, the SR's seem to be right on target if you are using the Crank/block matching system. My advice: Balancing is EVERYTHING, have a computerized ballace w/the crank pully and flywheel and pressure plate, make sure they are marked BEFORE dissasembly. Make sure they reassembled as they were marked. New Sockets, CANT GO WRONG. Make sure you have a 12pt socket for 12pt heads, and 6pt sockets, for 6pt heads. You dont want to even START to strip anything. A recently calibrated tourqe wrench. If you calibrator is local, ask him to measure differences using the extensions YOU will be using. New hardware. MOST IMPORTANT. New Hardware WHEREVER APPLICABLE. That means NEW OEM OR UPGRADED (ARP! get your credit card!). New Mains, New head studs, new Rod Ends, new snap rings for pistons (ask me about that, i'll tell you a tale). Dont forget to take every measurement the FSM asks for. Dont forget to buy a NEW OEM OIL PUMP. It would be dumb to rebuild it and blow it because of oiling. Call West Co Justin. HAVE FUN. Dont Stress, if you are worried about getting this on the ROAD, buy another car for the time being, beater/whatever. Buy everyone who helps you beer/food. Machine Shops, tool shops, Justin... dont hesitate to ask questions, and dont walk in somewhere and put your foot in your mouth, no-one likes a know it all.
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05-09-2007, 08:53 PM | #18 |
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Oh, buy new ones, i found one of them in my oil pan, and knocking from the top of cyl 4. So I failed at assembling this engine.
New one on the stand, all ready more baller than the last. WestCo Justin is the MAN for OEM nissan parts, he posted in this thread, post #11
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05-09-2007, 11:38 PM | #20 |
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Have you torn the motor down yet?
Becuase if you havn't you might not even need to do all this that you are saying. You have to find the cause of your problem first. And you might possibly have to have your block bored, which means larger pistons, etc. Don't go buying something without even knowing your problem. Tyler |
05-10-2007, 12:33 AM | #21 | |
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Quote:
Oh, and what my engine repair instructer used to always say... cleanliness is key! Engine Rebuilding is alot of planning and measuring/calculating instead of actual work. So take your time. Good luck and have fun. |
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05-10-2007, 07:06 AM | #22 |
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I usually warn people against plastigauge as it has some flaws. It will not tell you if you have an oval shaped journal. It won't tell you if your main journals are in alignment. It also won't tell you if they're round either. It just tells you the clearance at that specific point. The only solution is about $300 min in measuring tools but most won't spend that so they use plastigauge. Many people just don't know any better and think it's the only way. Also clean and blow out all oil passages and oil lines/oil coolers. I can't tell you how many times I've seen someone spin a main bearing, rebuild the engine, and plumb in the same old oilcooler full of dead bearing material.
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05-10-2007, 03:59 PM | #24 |
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Check it out
http://www.ka-t.org/forums/viewtopic.php?t=4156
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05-10-2007, 04:19 PM | #27 |
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You'll need them to check piston ring gap...
Download the FSM, print it out, and read the entire section on rebuilding the motor... Then tear apart your engine, keep everything in order, and inspect/learn/compare against the FSM... You will learn a ton just by doing those couple of steps... |
05-10-2007, 04:43 PM | #30 |
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Clean the garage.
Not enough can be said about Simple Green. Hands down the best cleaner, and it will not destroy the surfaces you are cleaning. Lots of paper towels, masking tape and ziplock bags and sharpies to mark everything down.
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