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Camshaft Sprocket retaining bolt removal (Read 1582 times)
jeffd
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Camshaft Sprocket retaining bolt removal
May 10th, 2019 at 4:53pm
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Is there any reason i cannot crack loose the bolt holding the camshaft sprocket on before i lock the crankshaft and take off the belt?  I'm trying to minimize the risk that i may rotate the camshaft trying to crack this bolt loose. Its on there pretty good.  Everything i read says to lock crank remove belt etc.. 1st.

The intent is just to crack the bolt loose without worrying shoulld the camshaft rotate during the process and having the valves move hitting the pistons.  Obviously once i crack it loose i will set tdc and lock the crank before removing belt  etc..


  
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mazdaverx7
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Re: Camshaft Sprocket retaining bolt removal
Reply #1 - May 11th, 2019 at 10:27am
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You should never have to loosen the camshaft gear's retaining bolt or remove the camshaft gear during a timing belt change. Once the crankshaft is locked, that cam gear can move a little without worrying about valve contact with the pistons. I use that bolt to turn the gear a half a tooth to help take slack out of the belt. The valves won't just drop and slam into the pistons if the cam gear moves. Slight movement of the gear is normal during a belt replacement.
  

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Dave W
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Re: Camshaft Sprocket retaining bolt removal
Reply #2 - May 14th, 2019 at 12:17am
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+1 on that bolt has nothing to do with changing the timing belts.

You loosen the belt by loosen the nut on the offset rollers that adjust tension.
  

Dave - black 84 no longer exists. Sad 83 self destructed. All better now. Smiley
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KeithU2
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Re: Camshaft Sprocket retaining bolt removal
Reply #3 - May 14th, 2019 at 2:19pm
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1. Welcome!
2. What they said. Based on what little info we have in your question, I cannot imagine any good reason to loosen the crank bolt. I can think of a lot of good reasons not to.
  

'83 that kinda came in a box
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T_Ryan.
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Re: Camshaft Sprocket retaining bolt removal
Reply #4 - May 22nd, 2019 at 10:31am
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if you want to replace the seals, that would require removing the sprockets. best time to do this is when you change the belt.

the cam has a spot to place a wrench to counter.

my method is to lightly tap a triple square xzn bit into the cam bolt on a two foot breaker bar pointing to 2 o'clock. (it must be seated and this isn't the place to use a cheap bit) place your counter wrench on the cam where it points to 11ish.

with both wrenches in place, hold the bit with your left hand and the counter with your right hand as you push the breaker bar with your shoulder.

the bolt does strip sometimes so its best to have a spare.



  
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SactoJohn
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Re: Camshaft Sprocket retaining bolt removal
Reply #5 - May 27th, 2019 at 2:03pm
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Spray a little PB Blaster around that bolt too, let it sit for awhile, tap the bit with a hammer, spray it a little more, then it should be easy to loosen unless your car sat outside in bad weather for 30 years. After reading all the horror stories about that bolt I was prepared for a hard time, but it was really easy to remove. Luckily, my car has almost always been stored indoors or in very mild weather.
  
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Catellus Engineering
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Re: Camshaft Sprocket retaining bolt removal
Reply #6 - May 27th, 2019 at 9:10pm
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Counterhold the cam shaft.  It should have flats on it you can use with a wrench.
  

Kevin
Catellus Engineering, Inc.
catelluseng@gmail.com
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