slatgrille Posted July 15, 2023 Report Share Posted July 15, 2023 As related to my other posts regarding head removal and paint color, while cleaning it up I discovered a small hole that appears to be manufactured in the #6 combustion chamber. On the top of the head is a small square head fitting directly in line with the hole. Anyone know the purpose of this? Inside where the fitting attaches it appears to have a piece blocking the hole from going through the head. This is located between the back two center head bolts. Thanks again! Craig Quote Link to comment Share on other sites More sharing options...
Solution Los_Control Posted July 15, 2023 Solution Report Share Posted July 15, 2023 That is a plug to locate tdc of #6 piston. .... 1 & 6 both are tdc at same time, while one is compression stroke other is exhaust stroke. They will fill up with carbon ..... use a nail & hammer & punch it out While you have the head off. I punched mine out with the head on, then when I started it the carbon chunk got caught in the exhaust valve seat & sounded terrible until it was pushed out through the exhaust ..... I would not recommend or do it again myself ..... maybe drill it out into small powder. Quote Link to comment Share on other sites More sharing options...
slatgrille Posted July 15, 2023 Author Report Share Posted July 15, 2023 Wow! Doesn't this affect compression in #6? My Model A and WWII jeep don't have this when #1 and #4 are at TDC...seems like 'over engineering' to me. Thank you 'Los'. Craig Quote Link to comment Share on other sites More sharing options...
D35 Torpedo Posted July 15, 2023 Report Share Posted July 15, 2023 14 minutes ago, slatgrille said: Wow! Doesn't this affect compression in #6? My Model A and WWII jeep don't have this when #1 and #4 are at TDC...seems like 'over engineering' to me. Thank you 'Los'. Craig It's negligible. Whoever had my car before me, thought the oil gauge went in that hole....needless to say, I had to massage the oil pressure gauge back into shape. 1 Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted July 15, 2023 Report Share Posted July 15, 2023 43 minutes ago, slatgrille said: Wow! Doesn't this affect compression in #6? My Model A and WWII jeep don't have this when #1 and #4 are at TDC...seems like 'over engineering' to me. Thank you 'Los'. Craig well, over here, we look at Jeep and Model A as UNDER ENGINEERED.....? 1 Quote Link to comment Share on other sites More sharing options...
Sam Buchanan Posted July 15, 2023 Report Share Posted July 15, 2023 (edited) 3 hours ago, slatgrille said: Wow! Doesn't this affect compression in #6? My Model A and WWII jeep don't have this when #1 and #4 are at TDC...seems like 'over engineering' to me. Thank you 'Los'. Craig It's been affecting compression for about 80 years and several hundreds of thousands of engines....... We consider it "clever" engineering. Edited July 15, 2023 by Sam Buchanan 1 1 Quote Link to comment Share on other sites More sharing options...
slatgrille Posted July 16, 2023 Author Report Share Posted July 16, 2023 Touche' gents! I am humbled...? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.