Re: valve guide damage

Posted by Tim Cole On 2015/6/14 5:59:37

That's a shame. Most of these modern outfits think if they screw up you can just buy a crate motor and chop the thing up into a junkrod.

As is, the motor will still run. The guide in question will run hotter than the other cylinders.

The tappet will still go up and down but will wear oval eventually. A good machinist could install an insert for the tappet.

What caused this situation? If the motor is not cleaned sufficiently, soaked, and the area not gently heated prior to moving the guide, the carbon will split the block. Or it can be caused by not using the proper sized drift. The tappet portion is due to not cutting the guide off after it has moved or from careless attempts at same.

Once I did motor work on a very, very deteriorated V-12. The guides were stuck and rather risk cracking the water jacket I cut the guides off with a chisel. It worked out and the thing ran again.

If you don't plan on putting another 50,000 miles at 80 mph on the car it will probably do alright. I would just get a rebate from the machine shop and run with it. That will give you time to store a second block.