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Coeur d'Alene, Idaho
 
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2nd best way to lock crankshaft?

So, I know the best way to lock the crankshaft for a timing belt service is to buy the $200 tool. But I'm sure folks have come up with alternative ways to do it, so I'm looking for tips. The starter is off, and the clutch housing is off if that sparks any suggestions. My current plan is to finish with the clutch job by next taking the flywheel off and replacing the rear main seal and then putting the flywheel back on. So, I could lock things by using a couple of the flywheel bolts reinserted without the flywheel and zip tying a chunk of rebar through them to torque against in removing the front pulley. Or I could put the flywheel and new clutch on and use something jammed in the flywheel teeth with the starter still out. Etc.

Just thought of something - do I need a reference mark on the flywheel for this job? That would certainly settle it.

Thanks, Doug

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Old 08-13-2017, 02:31 PM
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Are you just changing the belts or are you doing the whole shebang? If you're literally just taking the old belts off and putting new ones on, you don't need a flywheel lock. Just set to TDC (pencil method in #1 cylinder since your flywheel is off) and take the old belts off and put the new ones on. Now if you're doing seals and waterpump and oil pump drive gear, etc then you will need a lock and you'll need the flywheel. And you can get the arnnworx lock for $45.
Old 08-13-2017, 03:28 PM
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I bought the Arnnworx for @$50 which has worked out quite wonderfully... You could also bite down real hard

Seriously: If you live in Mass, you're welcome to borrow mine. I've got an awesome set of tools
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Last edited by pfarah; 08-13-2017 at 04:03 PM..
Old 08-13-2017, 04:00 PM
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Arnnworx lock for the win. I can't count the number of times I've used mine. Worth its weight in gold.

Oh - as for a pencil in the #1 plug hole. DON'T use wood! One wrong move and it splinters and then you're going fishing through the spark plug hole. No fun. Use a PLASTIC chopstick! Ask me how I know this...
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Old 08-13-2017, 08:28 PM
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Coeur d'Alene, Idaho
 
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Kind of you to offer, but you made me realize I don't have my hometown on here. So now you can see that about 2800 miles of this great country separate us.

So, Im going to pull the pulley and put an oil seal and O ring behind it. So, I guess I'll be needing to hold things still. Thoughts without a lock tool?
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Old 08-13-2017, 08:31 PM
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Big pry bar locked into the flywheel ring gear teeth and a gorilla (or reasonable facsimile) to hold it.
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'82 931 - roadster project - forever incomplete.
'80 924 - spouse's yellowjacket.
Some wrecks and a 924 racer.
Old 08-13-2017, 08:38 PM
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Bit the bullet and buy one. At least try to borrow one so you do it right. No sense in maybe breaking a flywheel tooth off with a crowbar or some improvised tool. I'll loan you mine if you want. Priority mail will get it to you in 2-3 days if you can stand the delay. Shipping costs back and forth will just about pay for your own though.
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Old 08-14-2017, 04:49 AM
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Quote:
Originally Posted by Slam View Post
Arnnworx lock for the win. I can't count the number of times I've used mine. Worth its weight in gold.

Oh - as for a pencil in the #1 plug hole. DON'T use wood! One wrong move and it splinters and then you're going fishing through the spark plug hole. No fun. Use a PLASTIC chopstick! Ask me how I know this...
I mean I totally agree and I certainly wouldnt want to have to deal with it, but I dont know that a few fragments from a #2 pencil would put up much of a fight against the combustion cycle.
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Old 08-14-2017, 04:58 AM
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Quote:
Originally Posted by Bradical View Post
I mean I totally agree and I certainly wouldnt want to have to deal with it, but I dont know that a few fragments from a #2 pencil would put up much of a fight against the combustion cycle.
I can't remember where I read the thread but someone broke off a wooden dowel doing the TDC thing. All types of suggestions were offered but I think the head came off in the end. Danger is wood fragments holding a valve open for it to bend or burn. The effects of powdered pencil lead (graphite and clay) is up for discussion as to potential engine damage. All I know is writing (compression numbers, stack # or torque specs, etc.) on aircraft exhaust stacks with a pencil is a no-no. The extreme heat from the exhaust gases cause the carbon from the graphite to harden the steel locally leading to cracking. This is what I was told when I was an aircraft mechanic so I never did it to my planes or anybody else's.
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Old 08-14-2017, 07:39 AM
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$200 for a crank lock. I made one for my Audi 5000 out of some angle iron when doing the timing belt on it once. I then made the realization that the transmission cases are almost identical. It also fit my 944 perfectly. Cost me $5.. When I picked up the 88S I've been working on about 2 years ago, it came with a nice crank lock tool. I used it to do the belts on it.
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Last edited by dgcantrell; 08-16-2017 at 03:59 AM..
Old 08-15-2017, 10:58 AM
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There are some questionable ways to do it but given how tight you need to get the crank bolt getting the proper tool seems reasonable. $200 really? I think I paid $50 or so, Arnnworks is $45 and Amazon has one for $65-ish. shipped. I found a used one.
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Old 08-15-2017, 01:17 PM
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Quote:
Originally Posted by jhowell371 View Post
All I know is writing (compression numbers, stack # or torque specs, etc.) on aircraft exhaust stacks with a pencil is a no-no. The extreme heat from the exhaust gases cause the carbon from the graphite to harden the steel locally leading to cracking. This is what I was told when I was an aircraft mechanic so I never did it to my planes or anybody else's.
The amount of graphite from writing on something is enough material to locally harden steel? Thats interesting as hell, man. (No sarcasm here just to be clear)

I use the timing marks to set TDC, the OT mark and the bottom slotted mark, and the cam and balance shaft marks if applicable. If that bottom slot isnt perfectly centered in the bellhousing slot its not at TDC, I suppose watching a straw bounce up and down is effective too, but to me its easier to see wether or not that mark is perfectly centered than how high a straw is, for me anyway.
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Old 08-16-2017, 06:11 AM
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The flywheel lock costs like 50 dollars, just get one. Like this (not mine)

http://www.ebay.com/itm/PORSCHE-944-924-S-944-TURBO-951-s2-FLYWHEEL-LOCK-NEW-AFTERMARKET-TYPE-/222600201559?hash=item33d4018557:g:B5wAAOSwbtVZPxE ~&vxp=mtr
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Old 08-16-2017, 08:37 PM
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Coeur d'Alene, Idaho
 
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So, I have a manual transmission - why not simply put it in gear with the parking brake on like I've done with other vehicle crank pulley bolts?
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Old 08-26-2017, 06:35 AM
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Pinion gear is a weak link in the drive train. I've used a pry bar on the flywheel teeth with success many times, but thought better about trying your method, Idaho. I bought the arnworks tool after ten years of ownership.
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Old 08-26-2017, 06:48 AM
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I have a 2nd and 3rd best method 2nd method borrow pfarah's lock 3rd buy a second hand lock.

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Old 09-03-2017, 05:49 PM
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