Crankshaft pulley

Sometimes you can remove the starter and get a big screwdriver or similar wedged against the starter ring gear to prevent the engine from turning so you can take out the bolt. Also if you have room an pneumatic impact wrench will remove the bolt easily.

Js08016 What is this adapter you speak of

I just had the same problem, the pin on the crankshaft pulley sheared off and thereafter the harmonic balance r started to wobble and then a weird sound and I shut the car off. Worried that the timing might have been affected I dismantled the front portion of the engine in-order to get to the crank pulley and see if the timing marks had shifted on the cam pullies or if the belt slipped. I reinstalled the crankshaft bolt and turned the crank so that the cam timing marks and the engine TDC mark was lined up. All three timing marks were were still in order with the proper TDC timing marks. I but it back together making sure that the number one piston was up on the TDC compression stroke and .I tried to start the montero sport 3.5, 2002 xls but it wont start. I started all over re-timed and again no start. Now I'm concerned that since the 3.5 is an interference engine that some how when the harmonic balance r wobbled maybe a valve or two may have become bent. Remedy, good question. The easiest way to get the HB bolt lose is to put a 22mm socket on a good long 12inch breaker bar and lay the end of the breaker bar on the part of the engine frame on the right side lust below and in front of the battery. Turn the key a little and the power of the engine turning over with the bar braced firmly will loosen the bolt enough for you to unscrew the rest easily. Do not over crank the engine just a short click will do. also, do not force the bolt lose with an air gun the bolt may snap or the threads may become stripped. this happened to me and I re-taped the threads and had to buy a new bolt. I'm going to expose the timing belt, cam timing marks, crank timing marks, move #1 piston up to TDC on compression stroke and make sure all is rightly timed for the third time. Take of the intake manifold and everything else needed to remove the valve covers and spark plugs. Then install a camera into each cylinder to at least look at the top of each piston for damaged. if there alright I will be taking off the heads to look at the valves for damage. Ill report my findings soon.