no compression after lashing valves

ShiftTheDrift

New Member

Dec 16, 2002

365

0

0

Bakersfield, CA

Jan 13, 2007

#1

• Jan 13, 2007

• #1

I'm attempting to find out why after lashing my valves, the engine has no compression.. or at least it seems.

Before lashing the valves and cranking the engine in the correct rotation, you can feel the compression.. no problem. It takes lot's of force to rotate.

However, after lashing the valves, and rotating in the normal direction of rotation, the engine spins freely. Hence, no hissing sound or resistance.

Any ideas?

 

99FiveOh

15 Year Member

May 20, 2006

2,051

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99

J-Ville, FL

Jan 13, 2007

#2

• Jan 13, 2007

• #2

May be stupid, but are all the spark plugs installed?

 

final5-0

Mustang Master

Apr 6, 2003

6,817

12

79

DFW Texas

Jan 13, 2007

#3

• Jan 13, 2007

• #3

ShiftTheDrift said:

Any ideas?

Click to expand...

They are lashed tight enough
to
keep them off the seat is my idea

Grady

 

BlownFiveLiter

have car, will race....wait, it doesn't run

15 Year Member

Nov 29, 1999

3,133

18

108

Chicagoland

Jan 14, 2007

#4

• Jan 14, 2007

• #4

I'm with Grady on this one, because I've personally lashed my valves too tight before with the same result.

 

99FiveOh

15 Year Member

May 20, 2006

2,051

20

99

J-Ville, FL

Jan 14, 2007

#5

• Jan 14, 2007

• #5

wow, that makes sense. Valves can't shut because the rockers are bolted down too tight. I'll have to remember this for myself.

 

Zero Signal

Active Member

Feb 24, 2003

2,633

2

46

Tucson, AZ

Jan 14, 2007

#6

• Jan 14, 2007

• #6

Yeah you should really measure it with a dial indicator. But that's just me, I like knowing the numbers. Also, give your lifters time to bleed down if you hadn't done that. Otherwise you're fighting the spring when you tighten it.

 

ShiftTheDrift

New Member

Dec 16, 2002

365

0

0

Bakersfield, CA

Jan 15, 2007

#7

• Jan 15, 2007

• #7

As always, you guys have come through in fine style.

The valves were not seated and therefore all the compression was flying right outta the top end.

The valves are lashed correctly now and everything is good.

Thanks a lot ppl!!