Timing Chain Inspection and Replacement
- Thread starter Tynan918
- Start date
Autozone wants $23.99 for theirs... Shorter drive though, and probably better quality, yea ?
As mentioned above you need to center punch the broken bolt.
https://www.harborfreight.com/sprin...ing&utm_medium=cpc&utm_campaign=&utm_content=
Start with a very small drill bit so you can see if it is staying in the middle of the broken bolt and not wandering off and drilling into the block at an angle.
1/16 or smaller preferably smaller if you have one..
https://www.lowes.com/pd/DEWALT-2-Piece-1-16-in-x-Set-Titanium-Twist-Drill-Bit/3421520
Once you have a decent hole started the bigger bit will want to stay in that hole once you get it started there.
Sometimes the broken off bolt is not flat enough to get a start on it without the drill bit walking around. sometimes you need to make it flatter, a small end mill might work,
https://www.amazon.com/dp/B07F3WT7PK/?tag=gbody-20
Wrap tape on the side of the end mill or every time you touch the side of it to the threads in the hole you will cut into them. You just need a big enough flat to get a good hole started in the center of the broken bolt.
Lubricate the drill and the end mill if you use one.
https://www.harborfreight.com/sprin...ing&utm_medium=cpc&utm_campaign=&utm_content=
Start with a very small drill bit so you can see if it is staying in the middle of the broken bolt and not wandering off and drilling into the block at an angle.
1/16 or smaller preferably smaller if you have one..
https://www.lowes.com/pd/DEWALT-2-Piece-1-16-in-x-Set-Titanium-Twist-Drill-Bit/3421520
Once you have a decent hole started the bigger bit will want to stay in that hole once you get it started there.
Sometimes the broken off bolt is not flat enough to get a start on it without the drill bit walking around. sometimes you need to make it flatter, a small end mill might work,
https://www.amazon.com/dp/B07F3WT7PK/?tag=gbody-20
Wrap tape on the side of the end mill or every time you touch the side of it to the threads in the hole you will cut into them. You just need a big enough flat to get a good hole started in the center of the broken bolt.
Lubricate the drill and the end mill if you use one.
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Those are punches, you need center punches. Center punches have a point at the tip.
Odd that one of those bolts broke since its only a 1/4". Are you positive that its in the hole and broken ? If it is you need to be REALLY REALLY careful trying to drill that screw out. You dont want to screw up the threads in the block and its not exactly going to be an easy task doing it on your back under the car. Much easier with the motor on a stand. Follow everyones advice about using a center punch to put an indent in the flat of the broken bolt. Make sure you get one small enough to fit into the hole if needed. That "should" keep the drill from walking off the spot and damaging the threads. Use a very small bit. Maybe an 1/8 to start. You also cant drill into the bolt too far.
As far as reaming out the hole on the cover, you shouldnt have to do that. Those pins help keep everything aligned as far as the crank seal. Occassionally those pins are tweaked ever so slightly. This is why things should be test fit BEFORE putting sealer and gaskets on. At this point I'd take the gasket off the motor and just buy another one. Clean up the block again. Try putting the cover on one pin first and gently try to put it on the other side after that. WITHOUT a gasket and sealer. Trust me. I just did that on my motor less than two hours ago. At least you'll see how stuff fits and not waste a gasket or knock some grit into the opening. The right side pin on my motor wasnt perfectly straight. I put the cover on that pin first and the left one went right on. Its only a couple of thousandths but it can make it tight.
BTW, if you never saw my thread... This started out as a nasty leak from the cover gasket not sealing right due to my screwup. I didnt want to take apart a second time if I didnt get it fixed right. Believe me, this was the last thing I wanted to do. It sucked. Im going back out to finish putting everything together after I eat.
This isnt a hobby now. Its more like a crappy job. LOL
As far as reaming out the hole on the cover, you shouldnt have to do that. Those pins help keep everything aligned as far as the crank seal. Occassionally those pins are tweaked ever so slightly. This is why things should be test fit BEFORE putting sealer and gaskets on. At this point I'd take the gasket off the motor and just buy another one. Clean up the block again. Try putting the cover on one pin first and gently try to put it on the other side after that. WITHOUT a gasket and sealer. Trust me. I just did that on my motor less than two hours ago. At least you'll see how stuff fits and not waste a gasket or knock some grit into the opening. The right side pin on my motor wasnt perfectly straight. I put the cover on that pin first and the left one went right on. Its only a couple of thousandths but it can make it tight.
BTW, if you never saw my thread... This started out as a nasty leak from the cover gasket not sealing right due to my screwup. I didnt want to take apart a second time if I didnt get it fixed right. Believe me, this was the last thing I wanted to do. It sucked. Im going back out to finish putting everything together after I eat.
This isnt a hobby now. Its more like a crappy job. LOL
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These bits also work well. I used them to remove some broken exhaust manifold bolts on my L31.
www.harborfreight.com
Hinge Drill Bit Set, 3 Piece
Amazing deals on this 3Pc Hinge Drill Bit Set at Harbor Freight. Quality tools & low prices.
www.harborfreight.com
Well for starters, that broken bolt wasn't flat enough to get a punch hole centered and while trying to get it out, I'm sure I ruined my chances of getting it out, so I'll have to take my chances of it missing...🤦🏾♂...it wasn't there when I removed the prior timing cover...
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