804 holset turbo HELP!

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Dixie normous
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804 holset turbo HELP!

Post by Dixie normous » Mon Sep 16, 2019 8:58 pm

The holset H1A turbo on my marshall 804 has got quite a bit of play on the shaft, been told the parts are no longer available to rebuild it, can anyone tell me if there is an alternative turbo that will fit? Thanks



DAL PZ
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Re: 804 holset turbo HELP!

Post by DAL PZ » Tue Sep 17, 2019 11:20 pm

I used Charnleys for a service exchange replacement unit for the turbo on my 802 which I assume would be suitable for an 804. It replaced the original factory fit but for the life of me I cant remember the manufacturer. I will try to check & get back

Dixie normous
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Re: 804 holset turbo HELP!

Post by Dixie normous » Wed Sep 18, 2019 7:36 am

Thanks Dal, Charnleys have said they can no longer get the parts to recon the turbos, which is more than a bit annoying as part of the reason i bought the tractor was the fact they were (and still are!) offering the turbos on their website! I've been trying to find out if any other H1A model turbos will fit, they were also used on some masseys

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JohnP
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Re: 804 holset turbo HELP!

Post by JohnP » Wed Sep 18, 2019 9:16 am

I'm not 100% sure but didn't Marshall's fit Garret turbos to later engines? If so this could be a replacement.

Can anyone give details?

Have you tried Andrew at www.tractorspareparts.co.uk
JVP

If it ain't bust don't fix it!

DAL PZ
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Re: 804 holset turbo HELP!

Post by DAL PZ » Wed Sep 18, 2019 4:48 pm

I just Checked it was Holset - It had a warranty but I don't suppose that's worth the paper its written on. So now hopefully if I make sure it spools down every time & keep the oil changed it will see me out. The old one was probably 30 odd years old,,

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JohnP
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Re: 804 holset turbo HELP!

Post by JohnP » Wed Sep 18, 2019 5:48 pm

The end float on the turbo can be up to 0.006" and the axial clearance up to 0.010". This seems a lot but the shaft has to float on oil. With speeds of up to 100,000 rpm or higher this is critical.

The important thing is to let the engine idle for a short time before stopping to allow the turbo to slow down.

Holset is now owned by John Deere, if this is any help.
JVP

If it ain't bust don't fix it!

Dixie normous
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Re: 804 holset turbo HELP!

Post by Dixie normous » Wed Sep 18, 2019 6:12 pm

Thanks for the replies chaps. Unfortunately the play in my turbo is well outside the tolerance, it's almost at the point of the impellor hitting the housing. The only H1A turbo i can locate is off a perkins engine, i'll have to take my turbo and see if it matches before i buy it

diggerdeano
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Re: 804 holset turbo HELP!

Post by diggerdeano » Sun Sep 22, 2019 6:48 pm

airesearch/garret or holset.

Dixie normous
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Re: 804 holset turbo HELP!

Post by Dixie normous » Mon Sep 30, 2019 6:54 pm

I finally managed to get hold of a good holset H1A turbo from a massey ferguson, the serial numbers are different but everything is the same size. I had a bit of a fight with it to loosen and rotate both end housings to get the inlet and exhaust stubs to line up for the marshall but i now have a turbo! If i ever come across any decent H1A turbos i may grab them (if they're cheap enough) as they seem to be getting as rare as hen's teeth! Thanks for the help everyone

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