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Mitsubishi Delica Owners Club UK™ Mitsubishi Delica L300, L400 and D:5 Owners Club
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Belette
Joined: 04 Jul 2016 Posts: 41 Location: Moyen, Lorraine, France
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Posted: Thu Sep 20, 2018 16:49 Post subject: Sewing machine noise after new bigger exhaust, and turbo ? |
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Howdy,
I'm having a long and weird story with the music I get from my engine.
I mounted a new custom 2.5" exhaust on my Delica, and I now have some weird sewing machine noise under load. Whatever the engine temperature, or speed, it's quiet at idle or cruising, but as soon as I press the pedal, that sewing machine noise comes back and is in synch with the revs or valve. It feels like I put a piece of cardboard with cloth pin on one wheel.
The turbo whistle also vanished, and I can barely hear it, but a pressure test confirmed it was working, but it needs high revs to build pressure.
Now on a closer look, I noticed a missing bolt on the exhaust manifold. It should actually be a stud with its nut, but I only have a hole ! And some black soot over the manifold on that exact spot.
Could the noise come from that exhaust leak ? It could explain why the turbo needs more revs to build up pressure...
What do you think guys ? |
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Posted: Thu Sep 20, 2018 16:49 Post subject: Google Ads keep this community free to join! |
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andyman
Joined: 08 Dec 2012 Posts: 5602 Location: Penrith
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Posted: Thu Sep 20, 2018 18:16 Post subject: |
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Hi, Belette, is that one of the manifold-to-head studs? Does the noise vary depending if the engine is hot or cold? Have you tried blocking the hole with a short bolt and Gun-gum? Any change in the sound while you are fiddling with the hole obviously indicates the problem is in that area. But I reckon that if you have one cylinder blowing through its leaky manifold port, you could end up with a sound like you describe. A length of bath waste pipe with a rightangle bend on it works as a directional microphone if you plug the other ear. Just point the open end of the pipe at any suspect area, while keeping the angle joint end to your ear. _________________ Andy C L300 Super Exceed - over 100 smiles per gallon! |
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Belette
Joined: 04 Jul 2016 Posts: 41 Location: Moyen, Lorraine, France
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Posted: Sat Sep 22, 2018 13:15 Post subject: |
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Thanks Andyman!
I didn't try to put something in there, I saw that stud on google and the shape is not as expected, two threads with a flat surface in between, I'll try something and I also lost one of the three nuts holding the exhaust pipe to the turbo, but no black mark here.
It's getting harder to work on the van, the police came a few days ago, looks like it is illegal to do repairs on public street in France, even just in front of the house, not blocking anyone and I always keep everything clean |
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Belette
Joined: 04 Jul 2016 Posts: 41 Location: Moyen, Lorraine, France
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Posted: Sun Sep 23, 2018 9:24 Post subject: |
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I'm thinking about removing the entire manifold and turbo to renew all the seals, not much space to work there, how important is it to tighten everything back together ? I cannot see a way to squeeze my torgue wrench in there ! |
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andyman
Joined: 08 Dec 2012 Posts: 5602 Location: Penrith
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Posted: Sun Sep 23, 2018 23:44 Post subject: |
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Perhaps wrongly, but I rarely use a torque wrench. I just go by "feel" and experience. If you don't feel confident to do this, you could tighten an accessible nut/bolt with a spanner which can access all nuts and bolts, then check with the torque wrench how accurately you have estimated. If you have estimated accurately, then do the other nuts/bolts with the same spanner. _________________ Andy C L300 Super Exceed - over 100 smiles per gallon! |
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Belette
Joined: 04 Jul 2016 Posts: 41 Location: Moyen, Lorraine, France
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Posted: Mon Sep 24, 2018 7:30 Post subject: |
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awesome tip, thanks ! |
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Belette
Joined: 04 Jul 2016 Posts: 41 Location: Moyen, Lorraine, France
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Posted: Thu Sep 19, 2019 7:26 Post subject: |
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Just to close this one, I had a closer look, and found two missing studs on the exhaust manifold. I found the part number MD050074 on partsouq, which is not correct!
The correct stud should be M8 x 1.25mm 42mm long.
A bit of cleaning, new gasket, new studs and nuts, and the sewing machine noise is gone for good !!!! |
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andyman
Joined: 08 Dec 2012 Posts: 5602 Location: Penrith
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Posted: Thu Sep 19, 2019 21:55 Post subject: |
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Love and persistence overcomes all! Did you have to keep sneaking out to work on it while the gendarmes weren't watching? _________________ Andy C L300 Super Exceed - over 100 smiles per gallon! |
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Belette
Joined: 04 Jul 2016 Posts: 41 Location: Moyen, Lorraine, France
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Posted: Mon Sep 23, 2019 19:09 Post subject: |
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ahah, I managed to have a full week to work on the van, I spent most days in a friends backyard, flat enough, and we have a fair weather in september. For clutch and gearbox, I had to rent a workshop |
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