Shuboxlover 478 #1 Posted June 26, 2010 I finally got around to inspecting the D to see where it was leaking at. The MAJOR oil leak is indeed engine oil, and is coming from the back of the motor somewhere. If you look in the first picture, the leak is somewhere back by the engine block, near or above the oil filter mount....(maybe up by the flywheel ) that's pure speculation though. I can sit there and watch oil drip (not run, but pretty dang bad) down onto the starter and the bottom of the block. (as shown in pic #2) The second somewhat minor leak is (I think) coming from the front of the hydro pump (as shown in pic #3) I am more concerned about the engine oil leak, but would like to get both fixed. Does anyone have any idea what may be leaking. I am not familiar with 16HP onan's so I don't really know where to start. Thanks guys Attached Image (Click thumbnail to expand) Share this post Link to post Share on other sites
Shuboxlover 478 #2 Posted June 26, 2010 Here is the oil running down on the starter and bottom of the engine block Attached Image (Click thumbnail to expand) Share this post Link to post Share on other sites
Shuboxlover 478 #3 Posted June 26, 2010 Here is the picture of the Hydro pump leaking (presumably at the input shaft) Attached Image (Click thumbnail to expand) Share this post Link to post Share on other sites
rickv1957 72 #4 Posted June 26, 2010 The oil filter mount is bolted to side of engine,might be the leak,hope it is not the crankshaft seal,Hydro leak looks to be the shaft seal,Does your right head tin still fit on with that oil sending unit as it is not factory,Rick Share this post Link to post Share on other sites
Shuboxlover 478 #5 Posted June 26, 2010 hope it is not the crankshaft seal, Does your right head tin still fit on with that oil sending unit as it is not factory,Rick Why do you hope it's not the crankshaft seal? I do not have the right side engine tin. Is the Hydro seal hard to put in? What is involved with replacing the crank shaft seal? Share this post Link to post Share on other sites
wh79d160 52 #6 Posted June 26, 2010 The front pump seal (WH # 7877) is a CR seal # 7474. While you have the pump out, you just as well replace the trunnion shaft seal on side linkage too. (WH #103461) is a CR seal #6763. And while you've gone that far you just as well replace the manifold o-ring & the hydro valve o-rings. Look the hoses over good for cracks while you're in there. I'm am just putting mine back together. Welcome to the "D" world. Tom , Perry Ks. 1 Share this post Link to post Share on other sites
Shuboxlover 478 #7 Posted June 26, 2010 Is it a pain to replace the seals? What kind of fluid does it take? I am really more concerned about the oil leak.... but definitely want to get the hydro leak fixed too. Share this post Link to post Share on other sites
rickv1957 72 #8 Posted June 26, 2010 Is it a pain to replace the seals? What kind of fluid does it take? I am really more concerned about the oil leak.... but definitely want to get the hydro leak fixed too. You will have to remove engine to replace seals,hopefully if your crank seal is bad,crank bearing is not loose as well,you should replace head tin as it directs air to cool right side,Rick Share this post Link to post Share on other sites
Shuboxlover 478 #9 Posted June 26, 2010 You will have to remove engine to replace seals,hopefully if your crank seal is bad,crank bearing is not loose as well,you should replace head tin as it directs air to cool right side,Rick Do you have any extra tins Rick? Is it just a matter or disassembly to get the seals changed (gaskets and seals) or is there more to it than that? What would be the symptom of a bad crank bearing, cuz the engine runs VERY smooth. Does anyone have a manual for the motor and hydro pump? Share this post Link to post Share on other sites
ol550 830 #10 Posted June 26, 2010 Just a thought. Could the (engine) leak be hydro oil pulled toward the engine? The hydro seal is just a matter of moving the engine forward enough to work with the seal for the pump. Mike Share this post Link to post Share on other sites
tgranthamfd 29 #11 Posted June 27, 2010 Is that a oil sending unit or a pressure switch in pic #1? Have you changed the engine oil yet? If not someone could have messed up the rubber seal on the filter or left it off completely, just a thought though. I have seen oil pressure switches, on Chevy's, leak like crazy when the switch goes out, again just brain storming I don't know squat about the D series stuff or onan's. Share this post Link to post Share on other sites
tgranthamfd 29 #12 Posted June 27, 2010 That looks like an aftermarket GM oil pressure switch, if it is and it has gone out, they leak when they are out. Share this post Link to post Share on other sites
rickv1957 72 #13 Posted June 27, 2010 Dont have any tins,will keep an eye out though,Rick Share this post Link to post Share on other sites
Shuboxlover 478 #14 Posted June 27, 2010 Thanks for the suggestions guys, I don't think it's leaking from there, wouldn't it be leaking right at the switch??? It seems to leaking farther "into" the engine. I am guessing some disassembly will be required to find out, but the thing I'm worried about is, it only really leaks when the engine is running, so how would I tell where the leak is coming from if I have some of it torn apart. What kind of fluid does the hydro pump use??? Is the reservoir for the FEL (the left side upright) supposed to get pretty hot when in use? What kind of fluid does the FEL need? Thanks again Share this post Link to post Share on other sites
rickv1957 72 #15 Posted June 27, 2010 10w40 motor oil works fine in both,yes hyds warm up when used,Rick Share this post Link to post Share on other sites
Shuboxlover 478 #16 Posted June 27, 2010 Just looking over the Toro MPV and noticed they list an electric fan for the transmission, is that an option, or should mine have one? Because it doesn't. Share this post Link to post Share on other sites
rickv1957 72 #17 Posted June 27, 2010 Just the very latest Ds had the fan option,Ive only seen a few,Rick Share this post Link to post Share on other sites
pfrederi 17,640 #18 Posted June 27, 2010 If there is no fan you do need to watch the oil temp gauge. Over heating is not good for hydros...(still trying to figure out how to put a fan in my D200 with 3 pt and PTO....) As to your engine leak what does your oil pressure gauge read when running? If the sending unit is the leak I would think the reading would be somewhat low. Yes the left support column gets pretty warm when I am using the loader...nothing to worry about... Share this post Link to post Share on other sites
Shuboxlover 478 #19 Posted June 27, 2010 Well, I looked into my oil leak this afternoon. Here is what I found. I started it up again to see if I could pinpoint exactly where it was leaking. I think I saw a oil leaking from the top of the oil filter mount. It didn't seem like enough oil was coming out of there, compared to what was dripping on the ground. But I decided to tear into in and see if the gasket was bad or what. Once I got enough things off to get to the filter mount, I noticed the top bolt was not tight ( I didn't see any gap between the lock washer and the mounting ear or bolt head) but I was able to turn the bolt 1/2 to 3/4 turn until it was very snug. The bottom was not very sung either, not as loose as the top, but not tight enough. I cleaned everything up really well, and used blue RTV gasket maker to seal it up. HOPEFULLY this will solve the issue. What do you guys think? The more I think about it, it kind of makes sense. It only leaked when it was running. Don't you think that if it was the crank seal, it would leak just sitting there, and it wouldn't leak as much as it was? I'm gonna let the RTV set up, and hopefully put it back together tomorrow night. On another issue.....where could I get a oil pressure switch? Does anyone have a picture of one on the motor, so I know what it looks like? Thanks Share this post Link to post Share on other sites
rickv1957 72 #20 Posted June 27, 2010 Your D160 did not come factory with a oil pressure guage,maybe why head tin is not on but you might be able to use a mechanical guage and fit fitting and tube behind tin,Rick Share this post Link to post Share on other sites
wh79d160 52 #21 Posted June 28, 2010 Mine is a 79 & it has a fan, so I assume your 80 should have one also. I was talking to Rick the other night about taking the pto assy. out of a 74 D180 I have & putting it in the 160 w/fan & was asking if the PTO shaft would make it past the fan. He said it would. Rick probably has 6 or 7 NOS D's w/fans & R/PTO's . He could probably snap you a pic. The fan is connected to a temp sensor which, I think, is the one that snaps on the hydro manifold pipe right close to the fan. I think it comes on @ about 130 degrees. Tom, Perry Ks. Share this post Link to post Share on other sites
Shuboxlover 478 #22 Posted June 28, 2010 Your D160 did not come factory with a oil pressure guage,maybe why head tin is not on but you might be able to use a mechanical guage and fit fitting and tube behind tin,Rick What size of plug would I need (thread size) if I were to take the pressure sensor out and just plug it up? Share this post Link to post Share on other sites
pfrederi 17,640 #23 Posted June 28, 2010 To be sure remove the sending unit and take it to the hardware store with you.... Share this post Link to post Share on other sites
rickv1957 72 #24 Posted June 28, 2010 Should be 1/8"NPT,Rick Share this post Link to post Share on other sites
Shuboxlover 478 #25 Posted June 29, 2010 It's fixed It was definitely the oil filter mount to engine block seal. I used it for about 30 min and not a drop of oil. Thanks to all that helped.!!!!! :D Share this post Link to post Share on other sites
