basic 360 stuff
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basic 360 stuff
Hey guys:
i am new to this site and have a couple of basics to ask.
i am a big time amature mechanic and just found a 1970 f100 at an estate sale.
it has 65,000 original miles on it, 3 speed, 360 v8. It has been non-oped for a year.
i have two questions: what are the cylinder compression readings suppose to be. just did the basic tune up today ,but my book does not have numbers for what the compression ranges are suppose to be for a 360 v8. all the cylinders were within 10 points the readings were 122 for the low and 129 for the high.
also, on first start up the ole girl was belching blue/white smoke out the tailpipe. my four year old boys thought it was great and call her old smokey. anyway, the smoke has diminished but still does it at start up for a few seconds. at high rpm it is barely noticable but there is still a bit of color to the exhaust barely detectable. i assumed it was from sitting for a year and the more i drive it it will get better, but am looking for more educated info on this.....anyone??
i am new to this site and have a couple of basics to ask.
i am a big time amature mechanic and just found a 1970 f100 at an estate sale.
it has 65,000 original miles on it, 3 speed, 360 v8. It has been non-oped for a year.
i have two questions: what are the cylinder compression readings suppose to be. just did the basic tune up today ,but my book does not have numbers for what the compression ranges are suppose to be for a 360 v8. all the cylinders were within 10 points the readings were 122 for the low and 129 for the high.
also, on first start up the ole girl was belching blue/white smoke out the tailpipe. my four year old boys thought it was great and call her old smokey. anyway, the smoke has diminished but still does it at start up for a few seconds. at high rpm it is barely noticable but there is still a bit of color to the exhaust barely detectable. i assumed it was from sitting for a year and the more i drive it it will get better, but am looking for more educated info on this.....anyone??
Elder User
Joined: Sep 2003
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The compression readings seems good for an engine that has sat. Within 15% on all cylinders is what you are looking for.
It's not uncommon for engines that have sat for a long period to smoke. The smoke on startup is caused by bad valve stem seals. Some of the smoke while driving is caused by them as well.
Rings need to seat in again. Look for the smoke situation to improve, but you will need to replace the valve stem seals.
It's not uncommon for engines that have sat for a long period to smoke. The smoke on startup is caused by bad valve stem seals. Some of the smoke while driving is caused by them as well.
Rings need to seat in again. Look for the smoke situation to improve, but you will need to replace the valve stem seals.
FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
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From: Smith Mountain Lake, VA
Well your well within the limits on your compression even at 10%..I think you'll just be fine..The engine has not really set long enough to do any damage to anything..
Just be kind to the motor for a few hundred miles..dont baby it..but by no meens beat it...
give it some time then drive it like you would any truck..Good Luck! Russ
Just be kind to the motor for a few hundred miles..dont baby it..but by no meens beat it...
give it some time then drive it like you would any truck..Good Luck! Russ
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Thanks Guys !
hey i thought of something else last night..........i set the points via the book at .017 on the feeler gage, but when i put the dwell meter to it it was saying the gap was too large. i was getting a 20 degree dwell. the book said it should be between 24 and 29 so i re-adjusted to a 26 dwell and that was about a .007 on the feeler gage. which way is best? they seemed to run about the same at idle for either..............
jim
hey i thought of something else last night..........i set the points via the book at .017 on the feeler gage, but when i put the dwell meter to it it was saying the gap was too large. i was getting a 20 degree dwell. the book said it should be between 24 and 29 so i re-adjusted to a 26 dwell and that was about a .007 on the feeler gage. which way is best? they seemed to run about the same at idle for either..............
jim
Post Fiend
Joined: Jan 2003
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From: Iowa
Hey, mine sat for about 10 years between the time my brother stopped driving it and the time I started messing with it. Mine never smoked (blue anyway). I'd drive it for a while and see if it gets better.
I'd suspect a stuck oil ring. These normally work themselves free after a while, but can be persuaded free by using diesel rated oil. It's CI-4 / SL rated, and usually comes in 15w40. If you can find it in 10w30 use it. It's supposed to be good at preventing and freeing stuck rings due to it's increased levels of detergent and dispersant.
Good luck!
I'd suspect a stuck oil ring. These normally work themselves free after a while, but can be persuaded free by using diesel rated oil. It's CI-4 / SL rated, and usually comes in 15w40. If you can find it in 10w30 use it. It's supposed to be good at preventing and freeing stuck rings due to it's increased levels of detergent and dispersant.
Good luck!
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I always set a points ignition by dwell. Setting by gap is good if you have no access to a dwell meter but using dwell is the best way. Drive it easy for about a thousand miles and the smoke should clear up. I'd also recommend changing the oil and using Valvoline Max Life.
Chris
Chris
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thanks again guys for the quick responses to both of my postings. i like the idea about changing the oil and thanks i will continue to go by dwell settings too.
right now it is just a dump/lumber truck, but am planning on someday restoring it. took ole smokey on a shake down cruise today a total of 100miles there and back, plus a trip to the dump. she ran great, just feel bad for the people behind me on the downhill runs!! my wife likes the idea of what we are getting out of the ole girl in baby sitting fees. the boys (i have twins) play in her everyday.
when i figure out how to post a picture on this site i will do so.
see ya,
jim
right now it is just a dump/lumber truck, but am planning on someday restoring it. took ole smokey on a shake down cruise today a total of 100miles there and back, plus a trip to the dump. she ran great, just feel bad for the people behind me on the downhill runs!! my wife likes the idea of what we are getting out of the ole girl in baby sitting fees. the boys (i have twins) play in her everyday.
when i figure out how to post a picture on this site i will do so.
see ya,
jim
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From: South Dakota
Originally Posted by fordbeast_80
sounds like a good truck enjoy it, i drive mine everyday and love every minute of it.
Now that's a Daddy's Day present.
At least 'til Chuckie's boys come around.
Need to get those headers on Jon!!!!!!!!
Oh yeah one way to loosen up rings on non-cat motors is to fire the motor, run it by hand at about 1200 rpm, slowly pour 1/2 quart of ATF in the carb, then dump the rest in so the motor kills. Let it sit over night and run it for a few miles. Yep can oil up plugs but usually burns off.
BUT on high mile motors with carboned up rings this can lead to oil consumption. But then this would be a good time for a rebuild, warm cam, aluminum manifold and headers.
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