Broken dowel pin in crank!!!

[WPeschel]

I noticed the bolts in my harmonic balancer were loose after getting my truck back from the shop so i pulled it off to get all the bolts to go back on. . I noticed the dowel pin was not sticking out so I thought the mechanic had left it out from intalling the cam... . I bought a new one and whent to install it and noticed it was not missing, but broken off in the crank... . Well long story short I pulled the intercooler, radiator, and bumper all off to drill and get this dowel pin out... I drilled a hole and the dang ole easy out broke off ... i have tried to drill out the ez out but it wont drill!!! I dont know what to do at this point does any one have any suggestions??? Does the dowel pin need to be in there??

 

[TCluff]

I noticed the bolts in my harmonic balancer were loose after getting my truck back from the shop so i pulled it off to get all the bolts to go back on. . I noticed the dowel pin was not sticking out so I thought the mechanic had left it out from intalling the cam... . I bought a new one and whent to install it and noticed it was not missing, but broken off in the crank... . Well long story short I pulled the intercooler, radiator, and bumper all off to drill and get this dowel pin out... I drilled a hole and the dang ole easy out broke off ... i have tried to drill out the ez out but it wont drill!!! I dont know what to do at this point does any one have any suggestions??? Does the dowel pin need to be in there??

how much ez is sticking out

 

[nickleinonen]

cobalt bit might chew through an ez out. .

good luck

 

[betterthanstock]

You don't need dowel pin as long as you locate the tone wheel and pulley in the right spot. Use new bolts every time.

 

[WUnderwood]

use new bolts on the harmonic balancer every time? I havent heard this before, are you sure? just checking

 

[champspa]

drill a hole on a angle that gets to the back side of the dowel pin . tap the hole with a 1/8 pipe thread . get a grease gun and the dowel pin will march out . a grease gun can give 7k psi pressure

 

[nickleinonen]

drill a hole on a angle that gets to the back side of the dowel pin . tap the hole with a 1/8 pipe thread . get a grease gun and the dowel pin will march out . a grease gun can give 7k psi pressure

that is a lot of meat to take out of the crank snout... 0. 330" hole is pretty big to start trying to drill. . i'd be welding a small nut to the end of the dowel before trying drilling [but the risk of arcing the bearings & journals is there]

 

[TCluff]

i would put it back together and run it, the worst that could happen is it could blow up and you could rebuild it to your liking, those engines are soo damn tough i really wouldnt worry about it, make sure the tone wheel is in the correct location, no need to replace the bolts... .

 

[betterthanstock]

use new bolts on the harmonic balancer every time? I havent heard this before, are you sure? just checking

Yup. You are torqueing them an additional 90 degress past a certain torque. That's torque to yield. They grow longer every time.

There is this one guy who posted that he needs a new crankshaft after the dealer attempted to fix with helicoils the bolts, and they keep falling off. I believe he bought a used truck, and previous owner messed with the tone wheel timing.

Cheap insurance.

 

[champspa]

I was thinking more of a 1/8 hole to the back of the dowel pin. and the 1/8 pipe just in the front . Just thought it might help if not disregard.

 

[nickleinonen]

those bolts in the balancer are not torque to yield bolts. . the torque spec on them is a torque/turn. it is a more accurate method of obtaining the required tension on the fastener. the bolts are reusable.



INSTALLATION

1. Install speed indicator ring.

NOTE: The speed indicator ring is located over a dowel pin.

2. Install the crankshaft damper and bolts. Tighten bolts to 40 N·m (30 ft. lbs. ) torque, plus an additional 60°.

NOTE: The damper must be installed so the hole is located over the dowel pin.

3. Install the accessory drive belt (Refer to 7 - COOLING/ACCESSORY DRIVE/DRIVE BELTS - INSTALLATION).



the rod, main and head bolts are also all torque/turn. . they are not torque to yield on the isbe engine. if you want to change all the bolts, feel free to do so. i've got better things to spend my money on. .

 

[nickleinonen]

I was thinking more of a 1/8 hole to the back of the dowel pin. and the 1/8 pipe just in the front . Just thought it might help if not disregard.

it is a good idea [and would work], but not very practical for this application. 1/8" npt needs a 0. 330" hole for tapping. drilling through the dowel and getting pressurized grease/oil behind it would push it out, but there is a broken ez out in the way in the dowel pin. 1/4"-20 grease fitting thread could be tapped into a much smaller hole