91 Prelude timing belt break
03-02-2005 | 11:17 PM
#16
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Posts: n/a
Re: 91 Prelude timing belt break
twillmon@cybermesa.net wrote:
>
> Anyone know why that '85 breaks cams? It's on its 3rd. Every 100K
> miles. Each time within 5 miles of home (such luck! <G>)
This isn't a problem that I would consider common by any means. I can guess
at a couple of causes though such as an over tensioned timing belt or
incorrect clearance on the cam journals. It might be worthwhile to pull the
cam towers and measure the clearance with plastigauge (note that you'll have
to remove all traces of oil in order to get an accurate reading and also be
sure to remove all traces of plastigauge once you're done). Yet another
possibility is that there's reduced oil flow to the head. These engines
used a small jet called an "oil jet orifice" inserted between the head and
the block. This oil jet may have become blocked with crud thus reducing the
flow of oil to the cam bearing journals.
Eric
>
> Anyone know why that '85 breaks cams? It's on its 3rd. Every 100K
> miles. Each time within 5 miles of home (such luck! <G>)
This isn't a problem that I would consider common by any means. I can guess
at a couple of causes though such as an over tensioned timing belt or
incorrect clearance on the cam journals. It might be worthwhile to pull the
cam towers and measure the clearance with plastigauge (note that you'll have
to remove all traces of oil in order to get an accurate reading and also be
sure to remove all traces of plastigauge once you're done). Yet another
possibility is that there's reduced oil flow to the head. These engines
used a small jet called an "oil jet orifice" inserted between the head and
the block. This oil jet may have become blocked with crud thus reducing the
flow of oil to the cam bearing journals.
Eric
03-02-2005 | 11:17 PM
#17
Guest
Posts: n/a
Re: 91 Prelude timing belt break
twillmon@cybermesa.net wrote:
>
> Anyone know why that '85 breaks cams? It's on its 3rd. Every 100K
> miles. Each time within 5 miles of home (such luck! <G>)
This isn't a problem that I would consider common by any means. I can guess
at a couple of causes though such as an over tensioned timing belt or
incorrect clearance on the cam journals. It might be worthwhile to pull the
cam towers and measure the clearance with plastigauge (note that you'll have
to remove all traces of oil in order to get an accurate reading and also be
sure to remove all traces of plastigauge once you're done). Yet another
possibility is that there's reduced oil flow to the head. These engines
used a small jet called an "oil jet orifice" inserted between the head and
the block. This oil jet may have become blocked with crud thus reducing the
flow of oil to the cam bearing journals.
Eric
>
> Anyone know why that '85 breaks cams? It's on its 3rd. Every 100K
> miles. Each time within 5 miles of home (such luck! <G>)
This isn't a problem that I would consider common by any means. I can guess
at a couple of causes though such as an over tensioned timing belt or
incorrect clearance on the cam journals. It might be worthwhile to pull the
cam towers and measure the clearance with plastigauge (note that you'll have
to remove all traces of oil in order to get an accurate reading and also be
sure to remove all traces of plastigauge once you're done). Yet another
possibility is that there's reduced oil flow to the head. These engines
used a small jet called an "oil jet orifice" inserted between the head and
the block. This oil jet may have become blocked with crud thus reducing the
flow of oil to the cam bearing journals.
Eric
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