Houston we have a problem


IHC in the early to mid-fifties.

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Post Wed Jul 22, 2020 9:14 pm

Houston we have a problem

Even though i got the SD220 running after 20 years or more it ran rough and will not idle down. I decided to break out the compression guage which i should have already done. Zero compression in #5. Took the valve cover off and the rocker arm bearly toggles at all. Soinds like maybe a bent push rod or pssibly a lifter. I doubt the cam is just flat on that lobe but who knows. What is everyones thoughts? Looks like kind of a pain to remove the inspection cover but it sounds like that is where i am headed?

Thanks
Mike

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Post Wed Jul 22, 2020 9:50 pm

Re: Houston we have a problem

So i was able to slide the rocker over enough to pull the pushrod out. Big double bend in it. May have happened due to a stuck valve initially.

Anyone have a extra pushrod they can sell me? Does the BD240 use the same pushrod? I know the valve angle is different on the two.

Mike

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Post Thu Jul 23, 2020 7:10 am

Re: Houston we have a problem

If no one here has one most likely Coonrod's will have one for you.
56 S120 4x4,

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Post Thu Jul 23, 2020 8:48 am

Re: Houston we have a problem

Mike,
I am not familiar with Coonrods. Where are they located?

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Post Thu Jul 23, 2020 9:04 am

Re: Houston we have a problem

56 S120 4x4,

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Post Thu Jul 23, 2020 10:50 am

Re: Houston we have a problem

Someone needs to become familiar with Google Search.
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Post Fri Jul 24, 2020 12:11 am

Re: Houston we have a problem

You don’t need to pull the head to fix a stick valve. The stuck valve you can take the springs off. Hammer it down inside the cylinder. Ream the guide and reinstall the valve.
If you don’t have a valve guide reamer of the appropriate size there are other less expensive methods to clean the guide.

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Post Fri Jul 24, 2020 5:08 am

Re: Houston we have a problem

AK IHC wrote:You don’t need to pull the head to fix a stick valve. The stuck valve you can take the springs off. Hammer it down inside the cylinder. Ream the guide and reinstall the valve.
If you don’t have a valve guide reamer of the appropriate size there are other less expensive methods to clean the guide.


I'm not being a wiseguy here but I must be missing something, when finished how do you get the valve stem back into the guide if its dropped into the cylinder? Also wouldn't the swarf from reaming the guide end up in the cylinder too? I've never heard of doing it this way.
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Post Fri Jul 24, 2020 5:40 am

Re: Houston we have a problem

The valve will usually stop at the piston, unless your BFH is TOO big.
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Post Fri Jul 24, 2020 8:41 am

Re: Houston we have a problem

That would also mean you can't get the reamer all the way through the guide as the tip of the valve stem would still have to be part way in the guide for the piston to push it back up. Sounds like a good field fix but not a good shop fix.
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