SOHC Motor problems
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Black people go wooooo
Joined: Oct 2002
Posts: 195
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From: Portland, OR
SOHC Motor problems
When I took the head off of my motor, the cam was sitting at top dead center but the white mark on the timing belt was not at TDC. We took the belt off and when we put the head and belt back on, we turned the crank to be at TDC (but left the cam where it was because it was at TDC.
Why did my motor run when the crank and cam gear were not matched?
Also, right now I'm trying to turn the crank counterclockwise but it siezes at a certain point. I cant turn it past that point, but I can turn it clockwise up unto a certain point where it siezes again. Any ideas???
The key thing here that is confusing me is that when the crank WAS at TDC, the cam gear was not. So what I did was put the cam at TDC by rotatinig the crank, then took off the belt and the head. When the head was off I rotated the crank to tdc and then put the head and belt on. So after the head was put on, the cam and crank are both at TDC. Now, the motor doesn't work. I was getting a metal to metal noise the motor tried starting up the first time. The motor didn't idle, but it was attempting to start. Now, when I try to turn it on the motor refuses to move. This is because the crank hits a "stopping point" when I attempt to rotate it around a certain point.
I originally thought that maybe a piston was hitting a valve, so I loosened the cam so all the valves were shut but the crank still refuses to move.
Why did my motor run when the crank and cam gear were not matched?
Also, right now I'm trying to turn the crank counterclockwise but it siezes at a certain point. I cant turn it past that point, but I can turn it clockwise up unto a certain point where it siezes again. Any ideas???
The key thing here that is confusing me is that when the crank WAS at TDC, the cam gear was not. So what I did was put the cam at TDC by rotatinig the crank, then took off the belt and the head. When the head was off I rotated the crank to tdc and then put the head and belt on. So after the head was put on, the cam and crank are both at TDC. Now, the motor doesn't work. I was getting a metal to metal noise the motor tried starting up the first time. The motor didn't idle, but it was attempting to start. Now, when I try to turn it on the motor refuses to move. This is because the crank hits a "stopping point" when I attempt to rotate it around a certain point.
I originally thought that maybe a piston was hitting a valve, so I loosened the cam so all the valves were shut but the crank still refuses to move.
Junior Member
Joined: Dec 2002
Posts: 10
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You need to verify that the block is timed correctly with the head, theres marks for tdc on both, set them and install the belt.
as for the crank not turning, its pretty hard to get past the compression stroke. if the engine was running fine until the head gasket blew and you know the valves aren't hitting the piston then just keep pushing it will turn.
as for the crank not turning, its pretty hard to get past the compression stroke. if the engine was running fine until the head gasket blew and you know the valves aren't hitting the piston then just keep pushing it will turn.
のんびり～(´ε｀)
Joined: Sep 2000
Posts: 2,314
Likes: 1
From: San Jo, Cali
If you're sure all the timing marks are lined up right, and you're turning the crank by hand, it sometimes takes a lot of effort, even with the plugs out. I can usually muscle it past the compression stroke, but sometimes I use a cheater bar when I'm extra lazy.