'76 98 compression

lebesset · August 25th, 2007, 07:53 AM

my buddy has this car which he bought new in canada , shipped to europe when he moved back
he used it for a while , then stored ; started it up regularly for a while , then lost the keys 10 years ago so it stood in the barn
well , we are both now retired and decided to do a restore ; after some preliminary work , new lock /oil/ battery / wiring that the mice ate etc , she started up ran rough for a while , compression test , a little low except for one cylinder ...zero!!!!
clearly it hasn't dropped a valve so must be rings or similar
short of stripping , any bright ideas?

tia

442Harv · August 25th, 2007, 10:32 AM

Ring problem would not cause O compression. Being it sat so long, I would say you have a valve stuck open, or broken valve spring.Take the valve cover off and see if the rockers are moving. Do you have a cylinder leak down tester? That would help tell.

lebesset · August 26th, 2007, 04:14 AM

thanks harv .....have taken the cover off and looked at the springs / valves and they looked correct to me
HOWEVER .. in view of your observation that rings wouldn't cause zero compression will have another look ....I did try the traditional tap with a hammer but maybe I was a bit cautious
anyone heard of mice eating pistons ?

lebesset · August 26th, 2007, 04:25 AM

oh, and no leak down tester ....but easy to make an adaptor from an old spark plug and stick the airline on it ....should find a leak of this size !!!! thanks for that also

August 25th, 2007, 07:53 AM	#1 (permalink)
lebesset Junior Member Join Date: Aug 2007 Posts: 3	'76 98 compression my buddy has this car which he bought new in canada , shipped to europe when he moved back he used it for a while , then stored ; started it up regularly for a while , then lost the keys 10 years ago so it stood in the barn well , we are both now retired and decided to do a restore ; after some preliminary work , new lock /oil/ battery / wiring that the mice ate etc , she started up ran rough for a while , compression test , a little low except for one cylinder ...zero!!!! clearly it hasn't dropped a valve so must be rings or similar short of stripping , any bright ideas? tia

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August 25th, 2007, 10:32 AM	#2 (permalink)
442Harv Registered User Join Date: Mar 2007 Posts: 119	Ring problem would not cause O compression. Being it sat so long, I would say you have a valve stuck open, or broken valve spring.Take the valve cover off and see if the rockers are moving. Do you have a cylinder leak down tester? That would help tell.

August 26th, 2007, 04:14 AM	#3 (permalink)
lebesset Junior Member Join Date: Aug 2007 Posts: 3	thanks harv .....have taken the cover off and looked at the springs / valves and they looked correct to me HOWEVER .. in view of your observation that rings wouldn't cause zero compression will have another look ....I did try the traditional tap with a hammer but maybe I was a bit cautious anyone heard of mice eating pistons ?

August 26th, 2007, 04:25 AM	#4 (permalink)
lebesset Junior Member Join Date: Aug 2007 Posts: 3	oh, and no leak down tester ....but easy to make an adaptor from an old spark plug and stick the airline on it ....should find a leak of this size !!!! thanks for that also