Big block oil pressure |
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cyclobutch
Senior Member Joined: 08 Sep 2015 Location: Essex Branch Status: Offline Points: 750 |
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Yes it took me two glaces before I thought - F.
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Butch
V50 II - 'The Black Pearl' T3 - 'Blue' Eldo Loop - 'Jug' |
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Jools
Senior Member Joined: 19 Aug 2016 Location: Milton Keynes Status: Offline Points: 273 |
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My sump extension is indeed fitted in the correct orientation - I was careful to check this on assembly. Besides, if it wasn't, I'd have blown up the engine several hundred miles ago as no oil would be circulating at all!
As Brian pointed out, the extension requires the pump to lift the oil an extra couple of inches, which is why I suspected that the change had shown up an already existing problem, i.e. that the oil pump is worn out and the extra strain placed on it has now been revealed. I used brand-new gaskets from our chief supplier; there were no extraneous bits and pieces on either, and no weaknesses visible. I'll take it all apart again and check it out in due course.
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Jools
V1000G5 1972 T150V 1961 Royal Enfield Constellation 1971 Suzuki ACC50 erm... 1963 Philips Panda (and other assorted detritus) |
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Jools
Senior Member Joined: 19 Aug 2016 Location: Milton Keynes Status: Offline Points: 273 |
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Oops! Nope, I'm wrong on the oil circulation point!
Looking again at the pics, of course the oil will still be picked up by the pump. Note to self - look properly next time. Stupid boy!
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Jools
V1000G5 1972 T150V 1961 Royal Enfield Constellation 1971 Suzuki ACC50 erm... 1963 Philips Panda (and other assorted detritus) |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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So what goes through the two holes that would be misplaced? Feed to the filter and back? If so no oil again.
But this is academic, I think you need to check your oil pump.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Jools
Senior Member Joined: 19 Aug 2016 Location: Milton Keynes Status: Offline Points: 273 |
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I've never found a diagram that shows the lubrication system, worse luck.
As far as I can work out, miss-placing the two holes at the back of the sump will not stop oil from circulating (at least partially). The pump will still pick up oil out of the sump through the coarse filter and then push it through the oil filter proper, whereupon the filtered oil then should then go round the engine. However, in this case the oil won't go round the engine but simply drop straight back into the sump. I think.....
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Jools
V1000G5 1972 T150V 1961 Royal Enfield Constellation 1971 Suzuki ACC50 erm... 1963 Philips Panda (and other assorted detritus) |
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Gianni
Senior Member Joined: 16 May 2014 Location: Muswell Hill Status: Offline Points: 675 |
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I don't think the extra couple of inches will make the difference. Remember there is about 50 miles of atmosphere bearing down on the oil as well. As any engineer would say at this point, what was the last thing you did before the problem manifested? Pull that sump off and triple check the extension orientation, the tightness of the oil filter, and the contents of the sump. Reassemble without the extension and see if the problem goes away. You know it makes sense...
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Le Mans 1, Spada, Cali 1, T3 Mongrel, Le Mans V, Quota x 2, Stelvio TT
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Yes. The misplaced connection at the rear is the feed to rear c/shaft bearing. But as you say it will just go directly back to the sump. But also it means there's no pressure so it doesn't go anywhere else either. The pick-up then thru the cartridge filter is the only part that will work OK. |
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"Chicken nuggets don't dance on a Tuesday."
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Gianni
Senior Member Joined: 16 May 2014 Location: Muswell Hill Status: Offline Points: 675 |
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Did this issue ever get resolved?
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Le Mans 1, Spada, Cali 1, T3 Mongrel, Le Mans V, Quota x 2, Stelvio TT
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V7Chris
Senior Member Joined: 13 May 2017 Location: Powys Status: Offline Points: 1882 |
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Silly question, never having owned a big block. Do you need to increase the quantity of oil with a deeper,extended sump and if you did not, could this also affect the pressure negatively?
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Barry
Senior Member Joined: 02 Mar 2015 Location: Oxford Status: Offline Points: 2811 |
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With a sump extender fitted, you generally use the exact same amount of oil as without an extender. That is certainly the case with the 'official' Guzzi part (GU14003240 - as illustrated on the Gutsibits.co.uk site). When the part is manufactured by A.N.Other, you'd need to refer to their documentation, but I've certainly seen instructions related to those parts that convey the same message: same amount of oil, i..e as defined in your workshop manual. If you fit one, remember that you'll likely need a longer dipstick. Add the measured amount of oil, and mark the dipstick accordingly. |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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The point of the sump extenders is to drop the oil away from the crankshaft, not to increase the quantity of oil.
There is no reason why this should have any adverse affect on oil pressure.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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V7Chris
Senior Member Joined: 13 May 2017 Location: Powys Status: Offline Points: 1882 |
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Well in that case, I can definitely confirm on the basis of no particular knowledge at all that the reason for the failing oil pressure is without doubt due to either Brexit or Donald Trump.
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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No, definitely due to a combination of both. Neither could achieve this alone.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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Just out of interest why does the oil need to be further away from the crankshaft CHRIS |
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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If the oil surface level is too close then the movement of the crankshaft can pool the oil to one side.
In extreme situations worse can happen. I recall a BMC engine which suffered crankshaft failures, turned out the marks on the dip stick were too high and the crankshaft was hitting the oil.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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