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Old 07-30-2020, 05:36 PM   #1
500dollarBugeye
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Default Cam gear tension

When turning your cam gears by hand how much tension should there be? Passenger side intake and exhaust feel like they have spring tension (little to no movement), drivers side intake spins freely to a fixed point but I'm not forcing it past that, and drivers side exhaust won't budge. Need help since this is where my technical experience starts to taper off and I just have research to help me out.
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Old 07-31-2020, 02:59 AM   #2
bobjr94
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Default

First you have the crankshaft timing mark lined up ? When it's lined up then the pistons are all half way up/down so the valves won't hit them if a camshaft is turned.

But that is normal, each cam runs 2 sets of valves, there is only tension when they are opening a valve. The rest of the time the cam will easily spin, until it hits the lobe to open the next valve. If you try to move the stuck one hard enough it should snap and spin half way around.
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Old 08-04-2020, 12:09 PM   #3
500dollarBugeye
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Originally Posted by bobjr94 View Post
First you have the crankshaft timing mark lined up ? When it's lined up then the pistons are all half way up/down so the valves won't hit them if a camshaft is turned.

But that is normal, each cam runs 2 sets of valves, there is only tension when they are opening a valve. The rest of the time the cam will easily spin, until it hits the lobe to open the next valve. If you try to move the stuck one hard enough it should snap and spin half way around.
Sorry for the late response. Been too hot to work on the car here. Am I fighting compression with the one that's stuck? Also, I know these are interference engines, but can the valves hit each other?
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Old 08-04-2020, 02:10 PM   #4
nikau
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Originally Posted by 500dollarBugeye View Post
Sorry for the late response. Been too hot to work on the car here. Am I fighting compression with the one that's stuck? Also, I know these are interference engines, but can the valves hit each other?
Yes, the inlet and exhaust valves can hit each other. They can't hit the pistons provided you put the crank into the service position before removing the timing belt.
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Old 08-05-2020, 03:57 PM   #5
500dollarBugeye
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Yes, the inlet and exhaust valves can hit each other. They can't hit the pistons provided you put the crank into the service position before removing the timing belt.
"Service position" as in TDC? The arrow on the gear (not the TDC mark)? 90 degrees from TDC? Sorry for the noob questions but I'd appreciate any help
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Old 08-06-2020, 03:08 AM   #6
nikau
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Originally Posted by 500dollarBugeye View Post
"Service position" as in TDC? The arrow on the gear (not the TDC mark)? 90 degrees from TDC? Sorry for the noob questions but I'd appreciate any help
When the crank mark is at 12 o'clock and the cam gear marks are aligned on both sides.

At that point all the pistons are at the same position relative to the crank so no valves can hit them.
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