Author Topic: CP I may have found my problem.  (Read 750 times)

Offline 4Cruizn

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CP I may have found my problem.
« on: April 06, 2008 - 10:42:55 AM »
For those that don't know, I've been having an issue with a stroker motor that I installed in my hardtop and it has been giving me many headaches.  For some reason, #6 cylinder is blowing anti-freeze as is evident from the cloud of steam that flows out the exhaust and the steam cleaned cylinder.  First I pulled the head to inspect and took it to be pressure tested.  Comes back with a  :thumbsup: on the head.   :clueless:  So then I'm looking for a crack in the block.  Nothing is found?   :dunno:  I got frustrated and decided to let it sit and move to the next project and come back to it later with a fresh outlook.  I'm getting tired of tearing this car apart. 



Well it got nice outside for a change here in Michigan and I opened up the garage. I cleaned out some leaves started to organize alittle. Then I uncovered the engine and started doing some testing on the deck of the problem side of the engine. I wanted to check to make sure all was true and the most I found was a 2 thousands dip in the flatness of the deck.  Really very little when you think about it.  I would think that the gasket would make up for that.  So then I started running one of the bolts in all the holes and guess what??   I discovered it went into each of the holes the same distance . . . except one.  When I thread it in this one hole, It still has 6-7 threads showing when it bottomed out?  All the other holes it threaded in until there was just one thread showing.  Guess which hole was the shallow one? Yep! The one right next to #6 cylinder and the water jacket.  So my thoughts are that this bolt was bottoming out and not pulling the head down to make the head torque properly but still shows it torques on the wrench.   :banghead:

CP what do you think??   The first picture is the shallow one and the next is one of the others. 
« Last Edit: April 06, 2008 - 10:52:34 AM by 4Cruizn »




nivvy

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Re: CP I may have found my problem.
« Reply #1 on: April 06, 2008 - 11:44:57 AM »
That sounds logical enough... It may just be missing by a thread or something.... I had all my threads chased etc. before build....

I was always told the diameter of the bolt * 1.5 is all the further the bolt needs to go into the threads... after that is doesnt give it any "extra" strength...

ex:  .5" diam. bolt * 1.5 ='s .75" in the hole...

.002 difference is fine... when the indy maxx block aluminum showed up it was .004 off  :scared:

Im sure CP will chime in here.........
« Last Edit: April 06, 2008 - 11:47:29 AM by StRoKer »

Offline Chryco Psycho

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Re: CP I may have found my problem.
« Reply #2 on: April 06, 2008 - 01:01:41 PM »
Makes sense to me , my machinist taps all the holes to make Sure nothing bottoms out short & mills the decks to make sure the decks are dead flat as well, is Terry Not doing this ? Try running a tap down that hole & see if the holes is just dirty at the bottom or if it is a factory flaw  in the way the holes was tapped
 99% sure you found the problem, though

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