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| crankcase vent tube... https://www.smwebhead.com/phpBB3/viewtopic.php?f=5&t=9352 |
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| Author: | 204Angler [ Wed May 23, 2012 2:16 pm ] |
| Post subject: | crankcase vent tube... |
so have an 87 3.7L in a 195 and while running it looks like a lot of vapors are coming out of the tube....if it were a car I would call it blow-by. How much should be coming out of there? Also, this tube is supposed to just be in a clamp along side of the flame arrestor or is it supposed to go INTO the flame arrestor for gasses to be recycled through carb? Thank you |
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| Author: | ric [ Wed May 23, 2012 2:37 pm ] |
| Post subject: | Re: crankcase vent tube... |
An engine is an engine. It's still called blow-by. rings are worn. |
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| Author: | Paul I. [ Wed May 23, 2012 2:54 pm ] |
| Post subject: | Re: crankcase vent tube... |
"is it supposed to go INTO the flame arrestor for gasses to be recycled through carb?" Yes it is, I want to say "up to it, but not in it." Are you finding oil the the water after running the engine? |
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| Author: | 204Angler [ Thu May 24, 2012 7:27 am ] |
| Post subject: | Re: crankcase vent tube... |
Ok, because I was looking online and saw some pictures of that tube going into the flame arrestor. I havent checked the coolant for oil but I am not getting coolant/water in the oil; think that if I am not getting that mixed, it shouldnt be getting in the coolant either... |
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| Author: | ric [ Thu May 24, 2012 7:52 am ] |
| Post subject: | Re: crankcase vent tube... |
204Angler wrote: Ok, because I was looking online and saw some pictures of that tube going into the flame arrestor. I havent checked the coolant for oil but I am not getting coolant/water in the oil; think that if I am not getting that mixed, it shouldnt be getting in the coolant either... The PCV vent goes into the flame arrestor. I would do a compression test though |
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| Author: | Paul I. [ Thu May 24, 2012 8:02 am ] |
| Post subject: | Re: crankcase vent tube... |
Paul I. wrote: "is it supposed to go INTO the flame arrestor for gasses to be recycled through carb?" Yes it is, I want to say "up to it, but not in it." Are you finding oil the the water after running the engine? I may have miss-lead you. I know on the Mercs, they go right up to the arrester. There is standoff/holder that comes off the top from the though bolt & is S shaped to put it in from of the arrestor. On the Volvos, I just don't know. BUT, now I will have to look tonight at my service manual for my boat. |
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| Author: | 204Angler [ Thu May 24, 2012 9:37 am ] |
| Post subject: | Re: crankcase vent tube... |
Oh yeah I do plan on doing a compression test now that there is a possibility of blow by. It has plenty of power though...I can pull a wakeboarder with no problem with passengers on board and can cruise at 35. Paul... ha ha, sorry didnt mean to cause confusion. I understood what you said but, I guess I have been working on outboards for a while and this is my first stern drive boat so I just wanted to make sure I am doing this stuff correctly. I know that I need to order a book for the engine... I havent seen alot of pictures of 3.7's close enough to see where that tube goes...on the 470 (170hp) I saw the tube went directly INTO the flame arrestor. Thanks guys |
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| Author: | Graham R [ Thu May 24, 2012 5:00 pm ] |
| Post subject: | Re: crankcase vent tube... |
ric wrote: An engine is an engine. It's still called blow-by. rings are worn. Some "Blow by" occurs in all engines; thet's why the have PCV valves. cheaper to begin with to check the PCV valve than assuming new rings required (maybe choked open by build up over many years; Ford UK in the 1970/80's used to recommend cleaning them in petrol etc PS On my (later) VP the hose it attached to the outside of the flame arrestor. |
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| Author: | 204Angler [ Mon Jun 04, 2012 7:17 pm ] |
| Post subject: | Re: crankcase vent tube... |
Ok, sorry for the delayed reply. I will check the hole in the valve cover where the hose is and clean it well. Actually....I think the more I run it, the less visible the vapors. I will do a compression check in the mean time though just to make sure. THank you very much for the replies everyone |
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| Author: | Borchik [ Mon Jun 04, 2012 8:06 pm ] |
| Post subject: | Re: crankcase vent tube... |
As you run it more if the amount of vapors goes down then you have moisture in the engine. I just had one in the shop that had the same issue, so much moisture it would kill the engine at idle. 2 oil changes later and about 20 minutes of run time it ran like a top and no more issues. |
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| Author: | 204Angler [ Tue Jun 05, 2012 8:14 am ] |
| Post subject: | Re: crankcase vent tube... |
Borchik wrote: As you run it more if the amount of vapors goes down then you have moisture in the engine. I just had one in the shop that had the same issue, so much moisture it would kill the engine at idle. 2 oil changes later and about 20 minutes of run time it ran like a top and no more issues. Oh ok...well, I havent changed the oil yet so Ill do that today. Good to hear! Now I got my hopes up a little more. Thanks for everything gents |
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