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Garden Tractors Discussion Forum

Re: Vanguard Twin 16-HP

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11-02-2012 19:46:12

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2 things. "1" why did you switch to synthetic oil? That engine was never designed with the idea of using THAT oil. Sorry but the whole synthetic oil debate bothers me. In my shop, everyone seems to think that switching over will solve every problem and cure cancer and make them rich. All by switching oils. Sorry. I feel better now. I'm trusting that you did your homework on the matter. "2" seems/sounds to me like a headgaset problem. The gaskets will leak between the cylinder and pushrod hole. This may not show up on your leakdown test, but that is better that a compression test. Try your leakdown again with the engine hot, valve covers removed and pushrods off the rockers. This will allow you to test with the pistons at bdc, which should also tell you something about your cylinder walls. I think this may actually be 3 things. Hope this helps. Tim

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11-03-2012 11:14:06

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 Re: Vanguard Twin 16-HP in reply to mrjdman80, 11-02-2012 19:46:12  
Thanks for the two replies.

Tim, I did immediately change back to SAE 30W at the time I replaced the dipstick seal (I initially blamed the problem on the Synthetic oil). Not to argue the point, but the Briggs owner"s manual for this engine actually "strongly recommends the use of synthetic oil", but I"m not a fan. I"m to the point of just pulling the heads and visually inspecting the head gaskets as I have wasted a lot of time trying to diagnose this problem to no avail. The thing doesn"t start pushing oil until she"s warmed up.

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