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Old 07-17-2013, 07:51 AM   #1
mobe OP
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DT 360 oil pump feed lines interferes w/cover

I have a recently purchased 1974 DT 360 enduro. I took the oil pump cover off to bleed the pump and verify adjustment. The oil feed line was leaking because it was smashed against the case where it connects to the oil pump. I tried to turn the nipple to relieve the pressure and broke it.. I thought OK someone has put the wrong pump on. Ordered a used one from a 1974 DT 360 and the nipple on it also pinches the feed line on the case. It looks like the nipple should be rotated so it doesn't pinch the case. Is this a common problem. Thinking about dremeling the inside of the case to clearance it. Any ideas?

Also, anybody have pinging probs on pump gas. Switched to 100LL avgas and its better. Is this normal on these bikes?
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Old 07-17-2013, 07:54 AM   #2
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Pix?
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Old 07-17-2013, 07:57 AM   #3
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I cant imagine Yamaha would deliver a stock bike with a case that pinches an oil line,it just wouldnt work out. Ive had a few of these old enduros and the oil pump is one thing I never had to mess with,they always seem to work.

It shouldnt ping unless the timing is off or the jetting is too lean,they can tend to get hot in real hot weather. Also check close for air leaks around the inlet,and of course crank seals on a bike that old.
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Old 07-17-2013, 02:37 PM   #4
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Heat pump body?

I wonder if I heat the pump body if it will let me turn the feed inlet ?
The pump works great just having this interference problem.
I'll post pics when I get home this evening.
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Old 07-17-2013, 08:57 PM   #5
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Pic of oil pump


Right at the end of the feed line nipple is where it is being pinched by the case. Right between the 0 and the 3 on the feed line.
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Old 07-18-2013, 09:46 PM   #6
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Does the feed line nipple appear to be oriented correctly?
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Old 07-18-2013, 10:06 PM   #7
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The inlet is bigger than the outlet anyway.Even at max flow it's not going to restrict the pump. Put the cover back on and ride.
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Old 07-21-2013, 02:50 PM   #8
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The prob is it presses it tight enough to pinhole the line.
I dremmeled the inside of the cover to relieve the pressure some.
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Old 07-21-2013, 02:52 PM   #9
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Quote:
Originally Posted by mobe View Post
The prob is it presses it tight enough to pinhole the line.
I dremmeled the inside of the cover to relieve the pressure some.
And it took almost 40 years.
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Old 07-21-2013, 08:01 PM   #10
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No, it did not take forty years. I have put on two new lines. It takes about thirty minutes before oil starts leaking out of the bottom of the cover.
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Old 07-21-2013, 08:22 PM   #11
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Run it with the cover off and see where it's leaking. Are you sure it's not the end of one of the hoses?
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Old 07-21-2013, 08:56 PM   #12
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I can see the hole in the line.
It would be great if someone with the same bike could take a pic of theirs so I can see the feed line nipple orientation.
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Old 07-21-2013, 09:25 PM   #13
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You might want to check out yamahaenduro.com they have tons of info on DTs
Z
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Old 07-21-2013, 09:38 PM   #14
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Just a guess but is that clear line your using a little bit thicker OD then the stock black oil line they come with? That could be your interference problem,that and maybe that clear line isnt as tough as OEM?.

I recently had a problem with routing a vacuum line to the petcock on my 1200 Triumph,low and behold when I ordered the OEM line from Triumph it was a good bit smaller OD then what had been used.
It made all the difference with clearance in a few spots the line needed to be ran.
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Old 07-22-2013, 06:16 AM   #15
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Good thought foot dragger. I will order some stock line and check that.
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