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Bedford 28HP Timing Chain play


64EK26

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Hi

 

How much allowable play is allowed in the timing chain, see attached drawing

 

 

attachment.php?attachmentid=127082&stc=1

 

From the Bedford Shop Manual

Type: Duplex Roller

Pitch: 3/8"

Number of Pitches: 54

Width over Joint: 0.93" [is this the allowable play, as I have never come across this term before

 

Cheers

Richatd

Timing Chain.JPG

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Hi

 

How much allowable play is allowed in the timing chain, see attached drawing

 

 

attachment.php?attachmentid=127082&stc=1

 

From the Bedford Shop Manual

Type: Duplex Roller

Pitch: 3/8"

Number of Pitches: 54

Width over Joint: 0.93" [is this the allowable play, as I have never come across this term before

 

Cheers

Richatd

 

Richard,

The width measurement relates to the chain type. There should be no appreciable slackness. If there is a lot of slack then both sprockets need checking for wear as well, as when fitting a new chain on worn sprockets, it will not last long. Take a photo of yours on the engine, with you pushing one run in so we can see how much slack there is.

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Hi Richard

 

Thanks for the quick response, the distance I can push it in is about 7/8". That is why I was concerned. I will post a photo in the next few days (the enging block is not at my house at the moment, it is very heavy to lift!). I will also inspect the gears.

 

Cheers

Richard

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Hi Richard

 

Thanks for the quick response, the distance I can push it in is about 7/8". That is why I was concerned. I will post a photo in the next few days (the enging block is not at my house at the moment, it is very heavy to lift!). I will also inspect the gears.

 

Cheers

Richard

 

That is quite a bit of slack. When new they are snug, any slack allows backlash on the cam which ultimately effects both valve and ignition timing

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Hi

 

Sprockets look a little worn but are OK

 

This is what it looked like

 

attachment.php?attachmentid=127130&stc=1

 

and this is with a new timing chain (virtually no slack as what I had expected)

 

attachment.php?attachmentid=127131&stc=1

 

The chain had stretched about 1/4" !!!. God knows what it sounded like when it was last running

 

Cheers

Richard

Old Timing Chain.jpg

New Timing Chain.jpg

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