General: 850: Another "my 850 wont start properly since 2006" question

[John Brennand]

Originally Posted by RollingThunder

Hi John,

You can try using a good engine flush and oil change every month for a few months to try and remove the worst of the gum, or else pull the head off and do the job properly - remove and clean the tappets or even replace them outright as they are difficult to clean thoroughly.
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Thanks guys. What procedure do you recommend for flushing the engine ? Put in a "thin" oil, rev the engine for 1/2hr and drain -perhaps ? What specification of Mobil1 oil would you recommend to leave in - or is there only one 1 ?

Re the tappets - is replacing them a big job? - I have never done it but am fairly useful with a socket set and a Haynes? Or, how long would it take a competent mechanic at a "good" local non-Volvo garage to complete - which is what I use - so I can gauge the ££. It has to go in there for MOT next month.

Thanks again. John