VonCramp
Well-Known Member
We rotated the motor by hand and no binding. We also torqued one head and used play-do to clearance check the valves. No contact and .380 clearance.
Bent up stuff
- Thread starter VonCramp
- Start date
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When did you do this? With the push rods in and adjusted? .380 doesn't sound right.
Bent pushrods can also happen with coil bind and valve spring breakage can be from coil bind. Instead of pointing fingers at what is already a bad situation, concentrate on the cure. Do a leak down test on all cylinders. Make sure you have at least .060" valve spring clearance. from spring compressed solid to max. valve lift height. Also make sure pushrods are strong enough for the spring being used. Get a shop manual for tune up specs and make sure TDC on damper is correct.
Lustle
Well-Known Member
Do you mean 0.0380? 0.380 is over 3/8 of an inch. I'd double check that.
VonCramp
Well-Known Member
Yes. I know. Just like .500 is half an inch. My friend checked the play-doh thickness. He insists .380. Seems a lot to me too.
There is no way in holy hell you have .380" clearance. That's over 3/8"! No way, no how. I am tellin you sure as ****, the pushrods bent because valves and pistons occupied the same space at the same time.
VonCramp
Well-Known Member
Will the coil bind be obvious upon valve adjustment?
Is this the "same friend" who ruined your engine? And you believe him?
Seems to be a lot of unknowns here. Need to get some real accurate info before you can figure what course of action to take!
VonCramp
Well-Known Member
I believe you. I am running cometic .100 head gaskets though. Due to the closed chambers on the pro comp heads and my Pistons come out of deck at .027. I am not trying to deny anything. I am just wanting to fix it and do it right. How do I identify coil bind while adjusting the valves? Is it pretty obvious when the spring coils contact each other? I am still learning about valve train geometry.
Yes, you will feel the engine become difficult to turn because of coil bind. Watch the valve springs closely and see if they bind or not. Use a feeler gauge if necessary if it is difficult to see the space between the coils.
VonCramp
Well-Known Member
My plans tomorrow are to put air in the cylinders to check for leak down. As far as valve to piston clearance, I am unsure and uneducated on how to know for sure without doing another play-do test.
VonCramp
Well-Known Member
So, there should be some clearance between the spring coils while under load? Is it possible my friend had me buy the wrong length pushrods and that caused coil bind. However, we did not witness any while adjusting the lash.
Yes...and no offense when I say this, I dont know any "other way" to put it.
But you NEED to learn to do "all this" yourself. That way, there is a MUCH better chance for success. You improve yourself when you learn. Knowledge is irreplaceable and invaluable.
But you NEED to learn to do "all this" yourself. That way, there is a MUCH better chance for success. You improve yourself when you learn. Knowledge is irreplaceable and invaluable.
Do you know what valve springs you have? What height they were set at? That will give you an idea what kind of lift they will support. With the valves adjusted and at max lift you can check what coil bind is from there. But if you bent every push rod as you said, and you've got some broken valve springs, you need to have the heads gone through. Pull them off!
Yes. Valve springs have a minimum spec for space between coils at maximum lift.
Ok Rob, take over, I'm going to bed. Talk to you later. I'll be in Ga. next month, I'll give you a call.
VonCramp
Well-Known Member
I thought I was learning from this machinist but he does kind of go on speculation on a lot of things. I don't think he's actually fully assembled a motor on his own. I did build this Barracuda entirely on my own. When I started to get into race stuff is where the problems began. First it was piston to head clearance. Now it seems like coil bind is an issue. The thing is only the springs on #2 cylinder broke. All the others look to be fine. However all pushrods on passenger side are extremely bent.
1967 'cuda
Dropped on Head as a Baby
It IS possible to have a strange amount of valve to piston clearance if your camshaft is not properly timed with the crank.
I would rule that being a possibility out because he said it was running great?
1967 'cuda
Dropped on Head as a Baby
That's what I thought too but then I realized that with the subsequent damage it probably wasn't running as 'great' as the OP had thought. - Maybe??
I think at this point we have more questions than answers!
VonCramp
Well-Known Member
We installed it at zero. I have a three way adjustable timing gear set, but went with zero because 14* was factored in with cam specs.
1967 'cuda
Dropped on Head as a Baby
So you did degree the cam in? - Or did you just use the reference marks on the timing set?
I really don't know what your referring to here^^^^. I know I would have a real hard time letting the guy that messed with your car to ever touch or do any machine work to it again! You need to get with a better machinist and as others have said learn to work on your car yourself.
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