 crank bolt, loose? |
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| doobie123 |
 Jun 27 2023, 10:44 AM
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#1
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Member  Group: Members Posts: 86 Joined: 8-July 22 From: tucson Member No.: 26,683 Region Association: Southwest Region  |
working on my porsche 914, 2.0, 5 spd
i'll try to keep this short and still give the details so... i had the drive train out to do the clutch/flywheel and decided to freshen the top end. the car ran fine when i got it but, the clutch was bad so i took the plunge,(something i never did before) and went for it. put it back together and test drove it. it ran fine for the first mile or so but on my way back to the shop, it started making a banging or, knocking noise. i decided to check the valves and use the method of pulling the plugs and turning the cage by hand. pulled the plugs, went to turn the cage and it was loose. i was able to rock it and when i turned it, the cage turned but not the three bolts holding it. upon further inspection, i was able to turn the center bolt, (crank bolt?) with my fingers. i got a socket, (13mm) on it and can tighten it down but before it tightened, i could feel a clicking through the wrench. so my questions are does it just tighten on the cage? should there be a key way that the cage needs to engage? will tightening it the torque specks do the trick or do i need to drop the engine again? is there a chance i've done damage by running it? i know that there is a unknown as far as the damage but i'm just looking for some suggestions as to where i go from here. thanks |
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| r_towle |
Jun 27 2023, 11:04 AM
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#2
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Custom Member Group: Members Posts: 24,645 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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Looking at another thread..
You used the crank bolt to set the valves...so you might have loosened it while doing that. TBH....you can turn most of these Type4 motors by hand if you remove the plugs. Pretty simple if out of the car...or use the flywheel instead of that 13 mm bolt. That bolt gets torqued...and never touched again. It can be an expensive thing to fix if it munged the keyway in the tip of the crankshaft. Rich |
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| doobie123 |
Jun 27 2023, 11:14 AM
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#3
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Member Group: Members Posts: 86 Joined: 8-July 22 From: tucson Member No.: 26,683 Region Association: Southwest Region |
QUOTE(r_towle @ Jun 27 2023, 12:04 PM)  Looking at another thread.. You used the crank bolt to set the valves...so you might have loosened it while doing that. TBH....you can turn most of these Type4 motors by hand if you remove the plugs. Pretty simple if out of the car...or use the flywheel instead of that 13 mm bolt. That bolt gets torqued...and never touched again. It can be an expensive thing to fix if it munged the keyway in the tip of the crankshaft. Rich ok thanks rich, i only have the clymer manual and i'm not sure if its correct. do you know the torque spec on the crank bolt? thanks |
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Posts in this topic
doobie123 crank bolt Jun 27 2023, 10:44 AM
r_towle There is a woodruff key on the end of the crank th... Jun 27 2023, 10:53 AM Olympic 914 There is a keyway there.
Timing is set by marks o... Jun 27 2023, 10:55 AM
doobie123 ok, so i spoke to dr. 914 and he suggested to tigh... Jun 27 2023, 12:17 PM
r_towle Take the fan off.
Take a closer look.
If all part... Jun 27 2023, 12:43 PM |
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