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Thread: Turbo banjo bolt

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    Default Turbo banjo bolt

    Hi All, I know when replacing the turbo your supposed to replace the banjo bolt and copper washers, My question is is'nt there 2 banjo bolts? one on cylinder block and one on the turbo, Do i change them both? Thanks

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    Regular Member rich r's Avatar
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    Depends if you undid both...

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    well i've undone the one off the engine block to remove the turbo, But everyone states replace banjo bolt but theres one on the engine block and one on the turbo, Just wondering as everyone states banjo bolt or do they mean the pipe? Thanks

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    Regular Member rich r's Avatar
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    Normally with banjo bolts in general, you just need to replace the copper washers on either side of the banjo. These crush when you tighten the bolt up to form a seal, and are likely to leak if you reuse them.

    Having said that, I've had banjo bolts on and off brake calipers and turbos many times over the years and only occasionally had a leak. Often if you just heat the copper washers up with a blowtorch until they glow, then let them cool slowly, they'll have softened enough to seal properly again.

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    Thanks rich i know the banjo bolts have a little filter in them which is what gets blocked over time and blows the turbo But what i'm trying to get my head round is how do the holes on the bolt line up with the hole in the pipe i'm assuming it's all down to the design of the threads on hole/bolt

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    Vehicle : Signum


    Engine : 20 Dti


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    the bolt is machined to allow oil to pass the full circle of the bolt.

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    Regular Member rich r's Avatar
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    The banjo has a groove all the way round it's inside. The bolt that goes through the middle is hollow, and has a hole (or holes depending on it's size) that line up with the groove. So oil/coolant/brake fluid can pass from the pipe on the banjo through into the bolt and into whatever it's screwed into.

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    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

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    Only the Bolt into the engine block has a filter on the 1.9CDTI, so I'd only be changing that one. I did three turbo changes on the same one last weekend though with no issues.

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    Cheers all for replies, Nutron did you replace all disturbed gaskets for new ones. Thanks Tommy

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    Year : Nosey

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    Umm....no. I have changed turbos five times in the last two weeks, I'd be broke by now if I did.

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