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| Crank-shaft pulley mounting bolt: normal-thread & torque? http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=85479 |
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| Author: | Gypsy62 [ Sat Oct 22, 2016 8:45 pm ] |
| Post subject: | Crank-shaft pulley mounting bolt: normal-thread & torque? |
NOT reverse-threaded, correct ??? I know it's a stupid question, but I'm leaning >150# on this bugger and it still won't spin (doing front seal). Appreciate confirmation before I recruit the 4' breaker bar (onsite have my Impact but no compressor). Also, anybody got the correct installation torque in memory? Thanks! |
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| Author: | WWDiesel [ Sat Oct 22, 2016 9:18 pm ] |
| Post subject: | Re: Crank Bolt normal-thread & torque? |
Here you go: DESCRIPTION ------------------N·m-------Ft. Lbs. Crankshaft Hub Bolt------------275------ 203 Vibration Damper to Crankshaft Hub Bolts----------27.5-------21 Crankshaft Pulley Bolts--------32.4------ 24 |
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| Author: | Gypsy62 [ Sun Oct 23, 2016 4:09 pm ] |
| Post subject: | Re: Crank Bolt normal-thread & torque? |
Many thanks! 203# seems kinda' insane for a 5-passenger vehicle, no? Chugger earns industrial-grade torque... I scoped notes re rear-seal replacement crank-shim caution; I presume that's not a concern up front. Curious to see if crank is woodruffed or cam-style commando. |
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| Author: | Jsamps1345 [ Sun Oct 23, 2016 5:36 pm ] |
| Post subject: | Re: Crank Bolt normal-thread & torque? |
The large crank bolt on the front is a left hand thread. I was just looking at mine earlier today Sent from my XT1254 using Tapatalk |
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| Author: | Gypsy62 [ Sun Oct 23, 2016 6:13 pm ] |
| Post subject: | Re: Crank Bolt normal-thread & torque? |
Thanks for the reply. By "Left-hand thread" you mean "reverse-threaded", correct? Clockwise-off, correct? "Right-hand threaded" equals "Normal" , counter-clockwise off, correct? Sorry to pose a "would you like fries with that?" question, but I'm about to pull that sucker with a breaker-bar and want zero confusion. In fact, I'd greatly appreciate another experienced voice to confirm the crank-bolt removal rotation, particularly if it's reverse-threaded. Given that the tbelt pulleys are in fact "reverse-threaded", the crank's threads are not automatically a slam-dunk. At least not for me... (if anybody else searches LJ for "crankshaft bolt torque" etc., they may also appreciate some clarification here.) Thanks in advance. |
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| Author: | Jsamps1345 [ Sun Oct 23, 2016 6:20 pm ] |
| Post subject: | Re: Crank-shaft pulley mounting bolt: normal-thread & torque |
Not a problem, sometimes clarification is needed wit these engines. By left hand thread I mean in order to remove the bolt turn it clockwise Sent from my XT1254 using Tapatalk |
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| Author: | geordi [ Sun Oct 23, 2016 6:34 pm ] |
| Post subject: | Re: Crank-shaft pulley mounting bolt: normal-thread & torque |
Confirmed: crank is a reverse threaded bolt. Left (ccw) tighten, right (cw) loosen Sent from my iPad using Tapatalk HD |
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| Author: | Gypsy62 [ Sun Oct 23, 2016 6:39 pm ] |
| Post subject: | Re: Crank-shaft pulley mounting bolt: normal-thread & torque |
Many thanks, Gents! |
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| Author: | Jsamps1345 [ Mon Oct 31, 2016 10:10 am ] |
| Post subject: | Re: Crank-shaft pulley mounting bolt: normal-thread & torque |
I figure this would be the place to ask, I'm looking at trying to tighten this bolt now. Is there an easy way to keep the engine from turning to be able to torque it correctly? |
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| Author: | lacabrera [ Mon Oct 31, 2016 11:23 am ] |
| Post subject: | Re: Crank-shaft pulley mounting bolt: normal-thread & torque |
I made up a metal bracket that rested on the cross member with four holes that matched the crankshaft pulley with a larger hole for the bolt to pass through it. I guess you could lock the starter ring gear in a similar way. |
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| Author: | Jsamps1345 [ Mon Oct 31, 2016 11:33 am ] |
| Post subject: | Re: Crank-shaft pulley mounting bolt: normal-thread & torque |
Thanks, Thats a pretty good idea. I'll have to make something up then |
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| Author: | Gypsy62 [ Mon Oct 31, 2016 3:53 pm ] |
| Post subject: | Re: Crank-shaft pulley mounting bolt: normal-thread & torque |
I still haven't pulled mine yet (waiting on Head from machine shop to proceed), but in general for securing crank pulleys during bolt R&R (please tell me that at least the CRD's CRANK pulley is woodruffed!!!), I rely on a chain-wrench (prefer "vise-grip"'s version) wrapped-over a suitable length of old tbelt (12"ish) wrapped around the pulley. Typically there will be some sort of sturdy component-bracket that the wrench-handle can brace-against to prevent rotation; or if all the accessory brackets have been removed you can reinstall a bolt or bracket solely to serve as a brace for the wrench-end... Tip: whenever I'm waiting on a head, for protection against any potential interim oxidation I coat the top of the block, pistons and chambers with a sheen of motor oil and gently cover with lint-free rags. Before installation, use a metal-cleaning spray (or similar; brake-cleaner spray likely fine) to clean block & head mating surface = DRY, DRY, DRY. Conversely, the piston-tops/chambers can just be wiped and left 'slick'; (obviously) a mild pre-lubrication with clean new motor oil is not a problem for them. |
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