DPO means I need your help. Have pictures!

[lesingepsycho]

OK, here's the deal. My timing chain was dying very quickly as evidenced by the high pitched rattling coming from under the bonnet (and the fact that I had already checked/replaced EVERYTHING else). So, after a year of serious denial, I finally jacked the engine up and pulled the timing cover.

What a dreadful sight!

The DPO apparently SMASHED the crank sprocket on with a SLEDGE HAMMER and then forgot to install the oil slinger which meant that the chain was starved of oil and thus had a very short life.

MY problem is that the new crank sprocket that I bought doesn't fit any better. I certainly don't want to use the sledge hammer method but I only know of one other method and I have never had to use it before. I've only seen other people do it on TV and that is to heat the sprocket to expand it and cool the crank to shrink it. I'm a little bit nervous about putting the heat to the crank sprocket though because I wouldn't want to warp it or melt it or weaken it. SO, is there any advice any of you can give me on doing this safely and effectively?

PS, the crank pulley/dampner hadn't faired any better but fortunately I have a new one. Note the large CRACK by the key-way on the back.

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Needless to say my car had a lopey idle that would have shook an NHRA drivers teeth loose!
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Thanks everybody

 

[jlaird]

[ QUOTE ]
problem is that the new crank sprocket that I bought doesn't fit any better.

[/ QUOTE ]

I think I would measure the shaft with a mic. and do the same with the sproket.

Er,, find another vendor? Take it to a machine shop and have it fitted, I assume you have the engine out and broken down by now.

 

[Bugeye58]

If it were mine, I'd take it to a machine shop as well. They can probably restore the snout of the crank to normal.
Jeff

 

[lesingepsycho]

Thanks for the replies.

I did manage to figure it out however!

The engine is in the car and therefore is a large part of the considerations. I was stuck though on how to modify the crank snout in the car.

As is often the case, the solution came once I was out there gettin' greasy. Why make the peg smaller when you can make the hole bigger? Duh. Pretty much ate up the brand new stones on my brake cylinder hone but after a few minutes massaging away some material from the inside diameter of the crank sprocket, and I admit I did have to "love tap" it on a bit (but with the sense to use a block of wood as a drift), it finally popped on. From here out it should be a simple reassembly so my enthusiasm has been restored!

Thanks again,
JACK

 

[jlaird]

Yea, why not. Sounds like a good way to resolve that. Now don't forget the slinger this time.

 

[lesingepsycho]

Rest assured, the slinger is already on there!

 

[jlaird]

And you checked the sproket dots with a straight edge more than one time. And had some one else check as well I hope. Surely would not want to do that again.