Oh yeah, head work time
Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
I like 24 flats = 4 turns = .125" deep, great target.
The "motor" cannot be at TDC, but the piston in one of the cylinders can be. Just to be technically correct.
Remember, you want TDC Compression, not TDC Exhaust.
The "motor" cannot be at TDC, but the piston in one of the cylinders can be. Just to be technically correct.
Remember, you want TDC Compression, not TDC Exhaust.
Last edited by HD Pilot; Feb 24, 2016 at 12:44 PM.
Seasoned HDF Member
Joined: Apr 2014
Posts: 5,809
Likes: 2,549
From: UK
I have a little "doohickey" that screws into the spark plug hole. I put a balloon over it - that way I can turn the back wheel and see exactly when that cylinder is on the compression stroke and when it passes compression TDC and the balloon size starts to get smaller.
If I want to get really **** about it, I drop a depth gauge into the doohickey and can measure TDC to 0.001". But basically, the balloon does the job.
This way, I can do it without needing another person to spin the back wheel, as it's a right bastard to do with one hand given the cam ramps and valve spring pressure...
If I want to get really **** about it, I drop a depth gauge into the doohickey and can measure TDC to 0.001". But basically, the balloon does the job.
This way, I can do it without needing another person to spin the back wheel, as it's a right bastard to do with one hand given the cam ramps and valve spring pressure...
Thread Starter
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Outstanding HDF Member
Joined: May 2014
Posts: 3,410
Likes: 143
From: Palm Desert,CA
Got the PR's done this afternoon in between appointments. Hopefully all should be good.
When I was adjusting the lock nut on one of the PR's I noticed that the lower section was turning and so probably affected the length, I quickly re-set.
My K&N Air Filter was super sealed against the faceplate and I think I may have bent it a bit when separating to clean it. As a result I think I may have a small gap between the rubber seal of the filter and the faceplate. Not sure if that makes a big difference but guess I'll go out and find a new filter if possible.
All that's left now is exhaust, AC, and tank...
When I was adjusting the lock nut on one of the PR's I noticed that the lower section was turning and so probably affected the length, I quickly re-set.
My K&N Air Filter was super sealed against the faceplate and I think I may have bent it a bit when separating to clean it. As a result I think I may have a small gap between the rubber seal of the filter and the faceplate. Not sure if that makes a big difference but guess I'll go out and find a new filter if possible.
All that's left now is exhaust, AC, and tank...
Road Warrior
Joined: May 2011
Posts: 1,956
Likes: 437
From: florida
I have a little "doohickey" that screws into the spark plug hole. I put a balloon over it - that way I can turn the back wheel and see exactly when that cylinder is on the compression stroke and when it passes compression TDC and the balloon size starts to get smaller.
If I want to get really **** about it, I drop a depth gauge into the doohickey and can measure TDC to 0.001". But basically, the balloon does the job.
This way, I can do it without needing another person to spin the back wheel, as it's a right bastard to do with one hand given the cam ramps and valve spring pressure...
If I want to get really **** about it, I drop a depth gauge into the doohickey and can measure TDC to 0.001". But basically, the balloon does the job.
This way, I can do it without needing another person to spin the back wheel, as it's a right bastard to do with one hand given the cam ramps and valve spring pressure...
Stellar HDF Member
Joined: May 2009
Posts: 2,066
Likes: 97
From: Northern VA
I've been using the same plastic straw with a sharpie mark on it for the past 6 or 7 times to find TDCC. Works great.
Robby you must be getting excited. No need to rush take your time and sit back and re-think through all the steps before hitting that starter. You can roll the engine over by hand using the tire to listen for any odd noises. Pulling plugs, grounding wires, and disconnecting fuel pump fuse and hitting starter for a few short bursts anyway wouldn't be such a bad idea to get oil flowing.
Robby you must be getting excited. No need to rush take your time and sit back and re-think through all the steps before hitting that starter. You can roll the engine over by hand using the tire to listen for any odd noises. Pulling plugs, grounding wires, and disconnecting fuel pump fuse and hitting starter for a few short bursts anyway wouldn't be such a bad idea to get oil flowing.