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| mechanical fuel pump bolts https://www.ausmini.com/forums/viewtopic.php?f=2&t=40191 |
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| Author: | maskilla [ Sat Mar 15, 2008 3:32 pm ] |
| Post subject: | mechanical fuel pump bolts |
Hi, putting on a crankcase breather mechanical fuel pump mounting: http://www.minimania.com/web/Item/C%2D2 ... Detail.cfm Noticed that the bolts are too short that are in the block, guess thats why the kit has longer ones. Are fuel pump bolts always threaded at both ends like pic below? What's the best way to remove them (for a noob)? 
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| Author: | TheMiniMan [ Sat Mar 15, 2008 3:53 pm ] |
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wind one nut onto the stud,,, then wind another nut onto the stud, then lock the 2 nuts together really tight & then try to undo the stud using the back nut (one closest to the block) that should do it alternatively buy a "Stud Removing tool" from Snap on or Repco or your local tool man cheers |
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| Author: | Morris 1100 [ Sat Mar 15, 2008 3:59 pm ] |
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Threaded at both ends is called a "stud" 
The beast way to remove them is by locking two nuts on the stud and winding them out. You fit one nut, then fit another nut behind it, then with two spanners you do the nuts up tight against each other, this will lock them onto the stud. Then undo them by turning the inner nut (not the front outer nut) I think most Aussie made engines had bolts. Why are buying a crankcase breather? Don't believe the sales pitch it is hooey! Quote: Crankcase Breather The A-Series engine has a reputation for leaking oil and/or smoking. One of the major causes of the various leaks is uncontrolled crankcase pressure. Remember that after the piston moves up in the block to create compression it also has to go back down in the block- this creates crankcase pressure. And if the piston rings are a little worn the ever present blowby can create considerable crankcase pressure.
Look at the rubbish that I highlighted. Kind of makes sense, until you think of the big picture. As the piston moves down it creates pressure? But what about the piston alongside that is going up? Wouldn't this create a vacuum? So the movement of the two pistons will cancel each other out. 
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| Author: | maskilla [ Sat Mar 15, 2008 4:27 pm ] |
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Thanks! Why didn't I think of that? I Love ausmini! The reason i got it is because I only have 1 breather on my 1275. Don't have a breather on clutch housing only on timing cover. Thought I give this a try and put them both onto a breather tank. |
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| Author: | simon k [ Sat Mar 15, 2008 4:30 pm ] |
| Post subject: | |
maskilla wrote: Thanks! Why didn't I think of that?
I Love ausmini! The reason i got it is because I only have 1 breather on my 1275. Don't have a breather on clutch housing only on timing cover. Thought I give this a try and put them both onto a breather tank. you shouldn't really need 2... unless you're compression rings are cactus. an old tin rocker cover with a breather on it would be a better idea
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| Author: | maskilla [ Sat Mar 15, 2008 4:33 pm ] |
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Will get one onto rocker cover soon. The old mechanical fuel pump was still there and unconnected!? so thought while I remove it I could fit the breather. Got everything now so might as well. |
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| Author: | simon k [ Sat Mar 15, 2008 4:46 pm ] |
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ahh, if you've already got the kit, then go for it - somehow I got the idea that you were thinking about buying one.. |
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| Author: | TheMiniMan [ Sat Mar 15, 2008 5:34 pm ] |
| Post subject: | |
Morris 1100,,, altho i agree with what you`re saying about the 2 pistons cancelling out the air moving from the other 2,,, there are other issues at play with regards to crank case breathing,,, one of which is the time it takes foir the air to actually move, it doesn`t happen in an instant,,, but the pistons are actually moving faster than within an instant,,, especially with higher revs & slightly worn rings,,, hence the reason why i fit at least 2 breathers on all my engines (& often 3 or more on the BIGGER ones) & let it be known that i don`t have any shares in MM  I make my own fuel pump hole breathers
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| Author: | drmini in aust [ Sat Mar 15, 2008 5:35 pm ] |
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Let us know how that one goes, I put an unbaffled one on my 1310 once (I adapted a Cooper S breather can by putting a flange on it) and it was useless. The crank and rods throw heaps of oil around at high RPM. Over 4500 it threw absolutely heaps of oil up the breather, I had to take it off. So I put a 1275 one on the flywheel housing.
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| Author: | Morris 1100 [ Sat Mar 15, 2008 6:51 pm ] |
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TheMiniMan wrote: Morris 1100,,, altho i agree with what you`re saying about the 2 pistons cancelling out the air moving from the other 2,,, there are other issues at play with regards to crank case breathing,,, Oh yes, I know that there are other forces at work I am just pointing out that what they say in the advert is crap. one of which is the time it takes foir the air to actually move, it doesn`t happen in an instant,,, but the pistons are actually moving faster than within an instant,,, especially with higher revs & slightly worn rings,,, hence the reason why i fit at least 2 breathers on all my engines (& often 3 or more on the BIGGER ones) & let it be known that i don`t have any shares in MM I make my own fuel pump hole breathers If they had just left out the bit that I highlighted red they would have been much better off.
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| Author: | maskilla [ Sun Mar 16, 2008 4:14 pm ] |
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For those who were interested, its done! (after many hours trying to fit arms down there with a spanner, thank god for girlfriends little hands.) . So far temporarily mounted tank. Drove around block and revved it up, hasn't thrown up any oil, can feel air coming through hose. Nothing in the catch can so far. Heres the pics for anyone interested. 
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