Oil pressure
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=152095
Printed Date: 01 Apr 2026 at 11:18pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Oil pressure
Posted By: Allis Wd45
Subject: Oil pressure
Date Posted: 14 Jul 2018 at 11:34pm
| When my wd45 get a to operating temperature the oil pressure is just below the n in the word normal. Is this ok to run this way if I use it for pulling a drag and a rolla bar rake. |
Replies:
Posted By: DougS
Date Posted: 15 Jul 2018 at 5:11am
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That's probably more oil pressure than you'll see on the average WD/WD45. |
Posted By: jaybmiller
Date Posted: 15 Jul 2018 at 6:10am
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ANY oil pressure is good pressure  Low revving engines don't need much oil, just has to move around 'here and there'. What probably kills most of them is overheating. Be sure to clean out the rad every few days,more if dusty and have a good working temp gauge. ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: steve(ill)
Date Posted: 15 Jul 2018 at 8:06am
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what weight oil are you using... a slightly thicker oil will add a couple psi. ------------- Like them all, but love the "B"s. |
Posted By: DougS
Date Posted: 15 Jul 2018 at 9:00am
At the expense of oil flow. |
steve(ill) wrote:Posted By: Allis Wd45
Date Posted: 15 Jul 2018 at 9:07am
| I’m using SAE 30 |
Posted By: Unit3
Date Posted: 15 Jul 2018 at 9:39am
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I have seen my dad run the "C" & "WD45's" without the valve cover to set the tappets running. They don't have much oil pressure at low idle, but they do make good oil volume. Seems to always be enough for them. ------------- 2-8070FWA PS/8050PS/7080/7045PS/200/D15-II/2-WD45/WD/3-WC/UC/C |
Posted By: Allis Wd45
Date Posted: 15 Jul 2018 at 4:03pm
| I also noticed that if it idles and I rev it up to about 1/4 throttle it gives a puff of blue smoke is this normal? |
Posted By: 79fordblake
Date Posted: 15 Jul 2018 at 4:52pm
| These engines don't have valve stem seals. When guides are worn the oil seeps down valve stem then gets burned. |
Posted By: Allis Wd45
Date Posted: 15 Jul 2018 at 6:51pm
| Is this enough oil to foul the plugs? |
Posted By: Allis dave
Date Posted: 16 Jul 2018 at 7:07am
Depends how bad it is. If you're not fouling plugs I wouldn't worry about it. Below the N is kinda low. I would put some 15-40w in it. I think even the good Dr has 15w-40 in his WD45, or at least he recommends it to help pressure if needed. If it's 90 degrees outside the tractor is warm 30 weight is going to get pretty thin.
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Posted By: Allis Wd45
Date Posted: 16 Jul 2018 at 10:48am
| Ok I’ll try that. |
Posted By: DrAllis
Date Posted: 16 Jul 2018 at 12:18pm
| From experience in the Spring of 1978....I found 30 wt to be thicker than 15W-40 when hot as used in a 7030 tractor.....47 psi oil pressure with 30 wt versus 45 psi oil pressure with 15W-40. |
Posted By: Allis Wd45
Date Posted: 16 Jul 2018 at 1:55pm
| That’s strange must be because 15-40 would act as a 40wt when warm? So should I run 15-40 then? |
Posted By: Allis dave
Date Posted: 16 Jul 2018 at 3:04pm
| I remember Doc saying before that for some strange reason SAE 30 is thicker when warm than warm 10w-30. Even though they're both 30 weight. I looked up detailed specs once after that and sure enough, warm SAE 30 was still thicker than warm 10w-30. I never looked to compare SAE30 to 15w40. I'm sure you could look it up. Valvoline has pretty good specs literature. |
Posted By: Allis Wd45
Date Posted: 16 Jul 2018 at 11:14pm
| Should I try to add washers to the pressure spring or will this do more harm than good |
Posted By: Stan IL&TN
Date Posted: 17 Jul 2018 at 7:27am
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If you remove the valve cover and start it up and have any oil dripping out of the rocker arm shaft then you have enough pressure IMHO. ------------- 1957 WD45 dad's first AC 1968 one-seventy 1956 F40 Ferguson |
Posted By: Allis dave
Date Posted: 17 Jul 2018 at 8:15am
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You could add shims to the pressure spring, but it probably won't help. The resistance to the oil system is in the oil filter and cam bearings. Usually the cam bearings get wore and allow too much oil through too easily which makes low oil pressure. You can read about how the oiling system works here: http://www.allischalmers.com/forum/wd45-full-flow-oiling-conversion-how-to_topic127481.html" rel="nofollow - http://www.allischalmers.com/forum/wd45-full-flow-oiling-conversion-how-to_topic127481.html
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Posted By: Johanwalter
Date Posted: 20 Jul 2018 at 12:44pm
| Check the pressure washer with a http://jonsguide.org/best-briggs-stratton-pressure-washer/#briggs-amp-stratton-20522-13-gpm-1700-psi-electric-pressure-washer-with-integrated-inflator-and-on-board-detergent-tank" rel="nofollow - - mechanical gauge first. Both oil filter and spinner seated correctly? Paccar brand filters? I have seen aftermarket filters not fit the housing correctly. |