Running on 7 not 8 Cylinders !!!
Discussion
My boss has an old 1980 2 door Rangie fitted with a 3.5 V8.
It has stood for a few years but he has renovated it cosmetically and we have had it running for a few months. (some may have seen the black Hagerty wagon at the Silverstone Classic !!)
On starting the other day it was running rough. A bit of investigation and it is not running on cylinder 3 even though it has spark to the plug. All other cylinders on the bank are running fine and it appears to have compression.
Before we going stripping it down, any ideas to possible causes??
Thanks in advance.
It has stood for a few years but he has renovated it cosmetically and we have had it running for a few months. (some may have seen the black Hagerty wagon at the Silverstone Classic !!)
On starting the other day it was running rough. A bit of investigation and it is not running on cylinder 3 even though it has spark to the plug. All other cylinders on the bank are running fine and it appears to have compression.
Before we going stripping it down, any ideas to possible causes??
Thanks in advance.
Could it be that the lobes for number 8 cylinder are too badly worn thus reducing lift? I had a similar fault on a low compression 3.5 V8 a long time back when I had just finished my 100" Bowler - I expected it to go like a scalded cat but it was awful. I hadn't long sold my diesel series One...a swift rebuild later and it was a lot better.
My guess would be the cam lobe worn away.
The valve hardly opens so you still have compression.
Your first move is to take off the rocker covers and measure how far each rocker is travelling. When you find one or more that are not moving as far as the others take off the rockers and check the pushrods. If the rods are straight then it has to be the cam. If the rod is bet then you may get away with just replacing the rod. In this case you need to check that the valve opens and then use redex in your fuel to keep it free.
Steve
The valve hardly opens so you still have compression.
Your first move is to take off the rocker covers and measure how far each rocker is travelling. When you find one or more that are not moving as far as the others take off the rockers and check the pushrods. If the rods are straight then it has to be the cam. If the rod is bet then you may get away with just replacing the rod. In this case you need to check that the valve opens and then use redex in your fuel to keep it free.
Steve
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