Turbo problem
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=157468
Printed Date: 21 May 2025 at 12:47pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Turbo problem
Posted By: JohnCO
Subject: Turbo problem
Date Posted: 21 Jan 2019 at 7:08pm
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Not the right color of yellow but yellow; I've got a Ford 555B backhoe that had a bad engine. Put a new one in and finally got it all together today after over 2 years of it being down. Put the turbo on and pumped some engine oil in it with a squirt can. When I started it up, it started blubbering oil out the exhaust. I didn't use the original return line which was 1/2" as it walked off somewhere. I put a 3/8" line in place and now wonder if it is allowing oil to back up and blow out the seal. Any thoughts? At least I got the expired sheep planted that my neighbor called me about on Friday-was getting pretty big, hoped he wouldn't explode as I rolled him into the bucket. At least that went right... ------------- "If at first you don't succeed, get a bigger hammer" Allis Express participant |
Replies:
Posted By: steve(ill)
Date Posted: 21 Jan 2019 at 7:48pm
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if you figure out the area of the inside of the pipe ( pie * radius xx2) , you will find out that the 1/2 inch tube will actually flow almost TWICE as much oil as the 3/8 tube... don't seem like it when you say 3/8 vs 1/2 inch, but doing the AREA inside , you see a BIG difference.. twice the flow is probably Half the back pressure on the seals. ------------- Like them all, but love the "B"s. |
Posted By: steve(ill)
Date Posted: 21 Jan 2019 at 7:50pm
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and the 3/8 FITTINGS are probably even worse restriction. ------------- Like them all, but love the "B"s. |
Posted By: wfmurray
Date Posted: 21 Jan 2019 at 7:58pm
| Rule of thumbs. Double the pipe size and increase flow four times. |
Posted By: JohnCO
Date Posted: 22 Jan 2019 at 12:30am
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Thanks guys, guess I'll replace the line and see if it works ok, learn something new everyday! ------------- "If at first you don't succeed, get a bigger hammer" Allis Express participant |
Posted By: DMiller
Date Posted: 22 Jan 2019 at 6:05am
| 3/8" line will have 1/4(or less) the cross section drain off capability of that 1/2" tube, Will either need to find a tube or step to such as 3/4" id hose to achieve the same results. Cummins changed from hard tube to hose in the 80's, hose was physically three times the outer diameter of the tubes. |
Posted By: JohnCO
Date Posted: 22 Jan 2019 at 1:44pm
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The old tube was 1/2" copper but it is MIA so I used a 3/8" that I had. May prove to be an expensive mistake if the turbo oil seal has blown out. ------------- "If at first you don't succeed, get a bigger hammer" Allis Express participant |
Posted By: jerbob
Date Posted: 22 Jan 2019 at 5:46pm
Good Luck John. ------------- HD16DC, Bobcat 863 Turbo, Oliver 1855, John Deere 855, |
JohnCO wrote:Posted By: DMiller
Date Posted: 22 Jan 2019 at 6:01pm
| Seals on turbos are finnicky things, Might be surprised to see it not leak soon as get drain oil away from it. |
Posted By: injpumpEd
Date Posted: 22 Jan 2019 at 6:46pm
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get a 1/2"(at least) drain line back on and it should eventually dry up. The seals won't "blow" per say, it just floods the turbo with oil it can't get rid of. ------------- 210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers! |
Posted By: DMiller
Date Posted: 23 Jan 2019 at 6:41am
| Personally I would go to a Hydraulic shop, see if they have any 1/2" Hyd Tubing scrap pieces that could be used for this, can bend in a Conduit bender just fine, copper is soft where could get mushed flat and do same thing. |
Posted By: JohnCO
Date Posted: 26 Jan 2019 at 7:49pm
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You guys rock! I replaced the return line with a piece of 5/8" copper tube along with new fittings and it WORKS! No oil coming out the exhaust. Thanks to you all for the advise. ------------- "If at first you don't succeed, get a bigger hammer" Allis Express participant |