 Rod bolts - a few questions and discussions |
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| ahdoman |
  Sep 21 2009, 03:40 PM
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#1
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It's phonetic...Ah-D-O-Man (Audioman)  Group: Members Posts: 667 Joined: 7-November 05 From: Santa Clarita, Ca. Member No.: 5,084 Region Association: Southern California  |
According to the experts it's imperative to replace the rod bolts when rebuilding. I've read the reason is because when they are torqued originally they stretch? Are they manufactured specifically to do that? If so, why wouldn't that make them weak? If reused why is that any different from reusing other bolts or parts under high torque? What's the science and logic behind this?
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| ME733 |
Sep 25 2009, 09:12 PM
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Senior Member Group: Members Posts: 842 Joined: 25-June 08 From: Atlanta Ga. Member No.: 9,209 Region Association: South East States |
(IMG:style_emoticons/default/popcorn[1].gif) IN stock standard form the rod bolts..are internal shuffle pins.....AND stretch BOLTS . .try taking them out of the bottom cap. they are really in there. they just dont; fall out. Look closely at the rod bolt at the portion that is in the top (cap) of the rod. you will see some very minor (polishing) rub marks, indentations,...you know that part of the rod bolt is against (something) which is the inside of the top cap. the rod bolt is a bolt...and a internal shuffle pin . Bet you have never even seen a "914 porsche rod bolt failure....goes for 911 porsches also. (I am talking street cars) NOT RACE CARS.....ALWAYS replace the rod NUTS...rod bolts in a low rpm 914...stock...probably not REQUIRED. but like everything...everything new in a fresh engine will give you piece of mind that a failure is impossable.(usually). (IMG:style_emoticons/default/popcorn[1].gif)
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| ClayPerrine |
Sep 27 2009, 11:59 AM
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#3
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Life's been good to me so far..... Group: Admin Posts: 15,541 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille 
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QUOTE(ME733 @ Sep 25 2009, 10:12 PM)  Bet you have never even seen a "914 porsche rod bolt failure....goes for 911 porsches also. (I am talking street cars) NOT RACE CARS. I have..... and it was in a street car. A dead stock 964 Cab being driven on the highway at the time of failure.  This is a picture of a 3.6L 964 motor. A broken rod bolt caused the #3 rod big end to separate. This caused lots of shrapnel that destroyed the top of the case, embedded pieces of the rod in the case. The flailing rod remains hit the oil pump and jammed it, and that caused the intermediate shaft to shear off. It also put some very large cracks in the crankshaft, and destroyed 4 pistons and three cylinders. The top of the case in that picture came off like a banana peel. I could see the rods. I have already stripped it, but I can get a picture of the remains of the case if you like. Rod bolts are cheap compared with the cost of fixing this type of damage....... |
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Posts in this topic
ahdoman Rod bolts - a few questions and discussions Sep 21 2009, 03:40 PM
SLITS Rod bolt are true "stretch bolts" and ar... Sep 21 2009, 03:54 PM 9146986 At least replace the rod nuts, I wouldn't scri... Sep 21 2009, 08:28 PM brp986s ARP is up in ventura. I went up there and bought ... Sep 21 2009, 10:22 PM
76-914
ARP is up in ventura. I went up there and bought... Sep 25 2009, 09:46 PM ME733 :popcorn: Rod Bolt stretch Guage....use....The gua... Sep 26 2009, 10:11 AM 76-914 Thx for taking the time to describe how this is us... Sep 26 2009, 12:25 PM brp986s :deadhorse:
the beauty of using a stretch gauge ... Sep 26 2009, 01:50 PM Cap'n Krusty All fanciness aside, I would NEVER assemble ANY 91... Sep 26 2009, 03:31 PM John Jentz I once asked Jake Raby if he thought stock used ro... Sep 27 2009, 11:06 AM |
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