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 Post subject: xpag cam timing
PostPosted: Sun May 12, 2019 8:22 am 

Posts: 23
Location: Delaware, Ohio
I am in process of rebuilding a 1953 TD engine for installing in TC1130. Getting ready to install timing chain & gears. I temporarily installed timing chain cover and crank pulley and rotated crank to TDC. Can someone please enlighten me on how to tell when cam is in proper position.
keyway on crank is pointing straight up. Should keyway on cam also point straight up? Should #1 intake valve be just opening, or #1 exhaust valve be just closing, or should both in take & exhaust be closed. I can't find anything in MG manuals that clarify this.
any help would be greatly appreciated.


 
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 Post subject: Re: xpag cam timing
PostPosted: Sun May 12, 2019 8:38 am 

Posts: 345
Location: Royston, South Yorkshire
There should be two marks on the sprockets, the originals were "T"'s. Not counting the links which line up with the "T"'s there should be 15 links between the marks on the right hand, longer side.

If you email me at norman@frenchblat.com I'll send you a manual with a picture.

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 Post subject: Re: xpag cam timing
PostPosted: Sun May 12, 2019 9:02 am 

Posts: 23
Location: Delaware, Ohio
Thanks, I do have manual with picture. Problem is that when I line up the links and "T"'s with 13 links on left side & 15 links on right side, they are not in same relative position as in picture. I just wonder if that makes no difference as long as the links line up, or should the links & "T"s be in relative position as in picture.


 
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 Post subject: Re: xpag cam timing
PostPosted: Sun May 12, 2019 9:11 am 
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Posts: 784
Location: Southern California
I've seen gears that were mismarked so that they would never line up. The best thing to do might be to get a degree wheel.

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 Post subject: Re: xpag cam timing
PostPosted: Sun May 12, 2019 9:39 am 

Posts: 23
Location: Delaware, Ohio
a degree wheel, hmmm!! I will look into that.
thanks


 
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 Post subject: Re: xpag cam timing
PostPosted: Sun May 12, 2019 10:54 am 

Posts: 23
Location: Delaware, Ohio
Looks like degree wheel is way to go. It will will find true TDC, and confirm intake opening(5* BTDC). and exhaust closing(5*ATDC)
on way to buy degree wheel.
thanks Steve


 
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 Post subject: Re: xpag cam timing
PostPosted: Mon May 13, 2019 5:03 am 

Posts: 23
Location: Farmington Hills, MI
Hi, here is a picture of the setup with the degree wheel, pointer, and a dial gauge configured on the first cam lobe (with a hardwood dowel between the roller cam follower and gauge pointer). You will need to know the correct settings for your cam profile unless it is ground stock.

I also used an adjustable cam gear to get the setting perfect.

Its a fiddlely process when you're doing it for the first time like I was! I spent a day trying to wrap my head around it. Good luck!
K


Attachments:
cam timing.jpg
cam timing.jpg [ 335.08 KiB | Viewed 359 times ]

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1948 TC 5510
 
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 Post subject: Re: xpag cam timing
PostPosted: Mon May 13, 2019 12:34 pm 

Posts: 23
Location: Delaware, Ohio
Thanks for input Ken. my situation is a little different in that the head is on the block. Due to some research I THINK I have it figured out. I can find true TDC using a piston stop device that fits in spark plug hole. And use a dial indicator on #1 valve lifters to determine cam timing.
Read about procedure on internet. Sounds logical, we'll soon see if it works.


 
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 Post subject: Re: xpag cam timing
PostPosted: Tue May 14, 2019 6:53 am 

Posts: 23
Location: Farmington Hills, MI
Rick,
Yes, that should work... really kind of the same thing i'm showing. The piston stop device will work and i used a similar technique using a spacer clamped to the block top to find true TDC in mine. good luck!
K

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