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YOUR RESEARCHHow do I put the piston at BDC for a bore scope?
Leading reported evidence
Use 24mm socket and wrench
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Suggestion
First take all your plugs out so you have no compression in the engine , then use a 24mm socket and wrench and use that on the crank pulley but, turn it clockwise to move the pistons, only clockwise !
Leading evidence: 'Use 24mm socket and wrench' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use 24mm socket and wrench' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
Use your camera to look inside each cylinder some will be down and others will be up, take a look at the ones you can see into then move the crank pulley to move the pistons which were at the top to the bottom , if you have a piston which is at the top, a half rotation on the crank will see it go down to the bottom, I'm sure someone will probably have worked out the crank pulley position to give you BDC (bottom dead centre) on each cylinder but I don't have that sorry and good luck!
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Suggestion · Original poster
Do I simply put it in gear, put a lug bolt back in and turn the hub & use trial and error?
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Use 24mm socket and wrench
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
First take all your plugs out so you have no compression in the engine , then use a 24mm socket and wrench and use that on the crank pulley but, turn it clockwise to move the pistons, only clockwise !
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Use your camera to look inside each cylinder some will be down and others will be up, take a look at the ones you can see into then move the crank pulley to move the pistons which were at the top to the bottom , if you have a piston which is at the top, a half rotation on the crank will see it go down to the bottom, I'm sure someone will probably have worked out the crank pulley position to give you BDC (bottom dead centre) on each cylinder but I don't have that sorry and good luck!
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10 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T113718Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi Everyone,
I haven't been able to find the answer for this. I'm changing my spark plugs this weekend and I also bought a bore scope I want to try out since I'll have the plugs out. How do I get the piston at BDC for the best view? Do I simply put it in gear, put a lug bolt back in and turn the hub & use trial and error? I'll have it on jack stands with the rear tires off.
I know that it's better to do this from the oil pan but that's not what I'm doing this weekend.
Hey think I can help you out ! First take all your plugs out so you have no compression in the engine , then use a 24mm socket and wrench and use that on the crank pulley but, turn it clockwise to move the pistons, only clockwise !
Use your camera to look inside each cylinder some will be down and others will be up, take a look at the ones you can see into then move the crank pulley to move the pistons which were at the top to the bottom , if you have a piston which is at the top, a half rotation on the crank will see it go down to the bottom, I'm sure someone will probably have worked out the crank pulley position to give you BDC (bottom dead centre) on each cylinder but I don't have that sorry and good luck!
Thanks for the help. Some questions: I was hoping to do this one plug at a time. Is it necessary to take all the plugs out at once for this? Which one is the crank pulley? I assume it's the lowest one in the center. Is it accessible without taking the bumper off? I've only had the car 2 months so I'm still learning.
Not as elegant but works: I took all spark plugs out, pulled the fuel pump fuse and rotated the engine with the starter. Takes a few tries before you get the piston in a good location.
I believe you need to take all plugs out before turning, otherwise it will be difficult because of the compression in the cylinder.
Yes take all the plugs out if you can do that when you turn the engine it won't have any compression to make it harder, crank pulley the big gold one at the bottom, you should be able to take air box out and have decent access, might be helpful to take bumper off to get plugs out though!
Well, if you are going to scope, you should do the bottom too - by taking the sump plate off. With the crank and rod bottoms visible, you can easily see TDC and BDC.
Top and bottom both is the proper way to scope.
You don�t need to pull the bumper to get to the crank pulley.
You can easily do it from up top once the air intake is removed.
You might be able to do it from the bottom without removing anything.
I�m not certain though.
