Help with a UD!!

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NissanUDhelp
Posts: 4
Joined: Fri Nov 15, 2019 6:05 pm
Car: 2008 Nissan Ud

Help with a UD!!

Postby NissanUDhelp » Fri Nov 15, 2019 7:35 pm

Hi everyone!
I have a 2008 UD 250k miles that’s very important to my business. Recently I noticed oil in the radiator and had the mechanic look at it (again). He says he’s fixed it, but when I am going uphill it’s very difficult to gain speed (well it’s hard period but very obvious up hill) and if I push it to even 50mph it will get too close to redline.

Just some of the things I recently have done:
Last
Piston sleeves (for the recent issue)
Fixed crack on one of the piston housings
Engine rebuild
Piston for air bypass
Transmission repairs twice
Radiator repairs twice
Turbo repair 4 times
Another engine rebuild

After all of this (and then some) I have no idea why the darn thing is so sluggish and bouncing off redline just to move. Any ideas? Thanks so much in advance
D


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AZhitman
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Joined: Mon Apr 29, 2002 2:04 am
Car: 72 240Z RB25, 63 Bluebird RHD, 63 NL320, 67 WRL411, 67 SPL311, 68 510 SR, 77 620 SR20, 89 Pao, 97 D21, 98 S14, 11 LS460L, 12 Titan 4x4.
Location: Surprise, Arizona
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Re: Help with a UD!!

Postby AZhitman » Sun Nov 24, 2019 10:24 pm

Oil in the radiator is typically a head gasket, which is a major repair (basically, a rebuild).

Symptoms sound like poor compression, which also points to head gasket failure.

NissanUDhelp
Posts: 4
Joined: Fri Nov 15, 2019 6:05 pm
Car: 2008 Nissan Ud

Re: Help with a UD!!

Postby NissanUDhelp » Sun Nov 24, 2019 10:25 pm

Thanks. I’ll ask the mechanic to check this next
Smh

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AZhitman
Administrator
Posts: 70004
Joined: Mon Apr 29, 2002 2:04 am
Car: 72 240Z RB25, 63 Bluebird RHD, 63 NL320, 67 WRL411, 67 SPL311, 68 510 SR, 77 620 SR20, 89 Pao, 97 D21, 98 S14, 11 LS460L, 12 Titan 4x4.
Location: Surprise, Arizona
Contact:

Re: Help with a UD!!

Postby AZhitman » Sun Nov 24, 2019 10:33 pm

Yeah, if he said he"fixed it", it would have been in the shop a while - that's not a quick or cheap repair.

I'm no diesel expert, but I'd also be looking for white tailpipe smoke and grey gunk in the oil.

NissanUDhelp
Posts: 4
Joined: Fri Nov 15, 2019 6:05 pm
Car: 2008 Nissan Ud

Re: Help with a UD!!

Postby NissanUDhelp » Sun Nov 24, 2019 10:41 pm

Ok got it I’ll look for that tomorrow. He charged me a fortune and it was In the shop for weeks - but it still has this issue..

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AZhitman
Administrator
Posts: 70004
Joined: Mon Apr 29, 2002 2:04 am
Car: 72 240Z RB25, 63 Bluebird RHD, 63 NL320, 67 WRL411, 67 SPL311, 68 510 SR, 77 620 SR20, 89 Pao, 97 D21, 98 S14, 11 LS460L, 12 Titan 4x4.
Location: Surprise, Arizona
Contact:

Re: Help with a UD!!

Postby AZhitman » Sun Nov 24, 2019 10:52 pm

Compression test will tell you a lot. Good luck buddy.

NissanUDhelp
Posts: 4
Joined: Fri Nov 15, 2019 6:05 pm
Car: 2008 Nissan Ud

Re: Help with a UD!!

Postby NissanUDhelp » Sun Nov 24, 2019 11:05 pm

Thanks 🤦🏼‍♀️

VALLEYBOY
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Joined: Thu Nov 14, 2019 9:28 am
Car: HARDBODY

Re: Help with a UD!!

Postby VALLEYBOY » Fri Dec 13, 2019 4:27 pm

Question: If the truck is hitting redline but not going anywhere, are you sure the issue is engine related and not drivetrain? Could your clutch/pressure plate/flywheel need some attention?

I'm only guessing but I think if the truck was struggling to put out power it would be hard to reach redline. Further, redline is redline and is tied to the gearing for you to know what your speed will be. <---confusing babble meaning, regardless of how much power my truck spits, 6000 rpm in x gear is gonna give me a pretty much the same speed every time. Difference being how long it takes to get there.

Just an uneducated guess tho :gotme


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