All, Here's a new one. Driving back from PA to VA in the 308 recently and threw a waterpump and alternator belt. Rats. Today I finally got down in the garage to replace them. The waterpump belt was still there but torn up and just hanging. The alternator belt was gone. The A/C compressor belt was still there and installed. Looked carefully and the A/C belt was in the crank pulley groove for the water pump belt. Hmm... Looked a little more carefully and the bolt that holds the crank pulley on was....gone! Along with its washer, of course. I haven't pulled the damper off yet, but at least one of the "woodruff keys" is still there....the parts manual calls them "tongues" and says there are two. I don't know if one is missing or not. Anyone know, other than obviously the Ferrari part sources, the specs on the crank pulley bolt so I can just buy a bolt? I found one source online that listed the price of the dumb washer at $33, so who knows what the big 36mm bolt will cost. Thanks, -matt '85 Euro 308
The harmonic balancer/pully has only one woodruff key. At least on my 78 GTS motor. The bolt is a 17mm X 32mm long with a thread pitch of 1. The washer is 52X7.5mm thick. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Buy the right bolt and washer and consider yourself VERY lucky worse didnt happen. The other key is under the timing drive gear and aint coming off without a fight. Eurospares, Ricambi, TRutlands, etc.. Any should be able to find you the correct bolt either new or used. Just torque it down properly and you shouldnt have to worry about it. Eurospares shows the washer #102755 at around $16, bolt #100476 supercedes to #138793 at about $115 (ouch).
Wow, thanks for the quick reply. I wonder if I can find that generically. I just did a little searching, and here: http://www.eurospares.co.uk/searchResult.asp?S=138793 it appears that the part number has been updated from 100476 to 138793. If you go to the URL, they don't have the price listed for this part which is the same for many models....no price listed for 308, 365 GT4 2+2, 400i, Mondial, Testarossa. They do have the same part priced for the 348 for £57.40. The same part number also fits an F50, and the price for that is £53.69. Maybe I'll just buy the F50 part! -matt
Go a used bolt & washer. They're not torqued heavily enough for thread wear to be an issue. See the 'where can I get parts' sticky thread. DO NOT RUN THE ENGINE W/O THE BOLT!!! With the bolt out, the timing drive gear can slip forward on the crank & change cam timing significantly. When doing timing drive bearing replacements, I've been amazed how much timing would be off just because the gear had slipped forward on the crank. I don't know if it can change the timing enough to endanger valves, but it's enough so that it would be a good idea to have a leakdown test done.
Same thing happened to my 328.....caught it before any damage happened. I found a used bolt/washer at Dennis McCann Ferrari parts. Not cheap, but cheaper than the alternative. Re-torque to specs and use the appropriate loc-tite.
I called Rutlands first, and for some reason that $115 bolt was $33 with them. The washer was more (but only a couple dollars). Weird... -matt
I plan to put everything back together today. As per the workshop manual, torque setting for crankshaft pulley bolt is ~145 foot-pounds. Does anyone recommend locktite? -matt
If you torque it properly to 145, it should stay put without locktite. Do not put anti-sieze or oil on the bolt. Insert it and torque it dry. If you are really concerned about a repeat situation, i'm sure a little blue locktite would not hurt. But 145 is a lot of torque and should not come loose on its own. In fact, I'd be wondering if it had been torqued properly after the last time belts were changed on the car or the damper was taken off. I know when I did the belts last year, it was a real gunt torquing that bolt, getting the leverage to pull on the torque wrench.
Doing some thread necromancy here, but in a worthy cause as google finds this thread pretty quickly when you go looking for the crank bolt thread specs... It's 18Mx1.5 not 17Mx1, on an '81 GTSi. 17Mx1 is a pretty weird spec.
