Loss of compression

[kunyang]

My Volvo 2002 is a little low on compression, and I am having trouble starting it. Seeking advise, I have been told to squirt a little oil staight into the chamber by taking of the air filter and giving a couple of squirts with the oil can. I did this and it is an instant start!!!!

However, in a force 8 with the wife on the helm, taking up the cockpit floor with the boat going all over the place, taking off the airfilter by lying down through the hatch and giving a couple of squirts, doesn't fill me with enthusiasm. What are the thoughts? I have been told that the engine may recover, and it is due to being left over the winter. Any ideas?

Dave

 

[Bilgediver]

Are you definitely activating the cold start.

I suspect that the engine will start OK the rest of the day once it has been run and yes it is possible there is a loss of sealing due to grotty valve seats. Have you checked you have the correct tappet clearance?

 

[old_salt]

An early in the day run up will help.
First check out the timing, injector pump, nozzle/spray,
But if it persists after all this then the truth is it's knacked. It's bite the bullet, do a head job first "grind the valves" then if no go new rings or even a re-bore.
By that time you will have a engine that will last you for the next 10 years with no probs.

 

[oldsaltoz]

A simple compression test without oil, than another after sdding some oil to each pot as you go will tell you if it's a vale or rings problem.

Little or no change with oil added indicates Valve/s. big change indicates rings.

Avagoodweekend......

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[bluedragon]

Standard practice on some old engines. Few squirts of oil into the inlet port is the best cold-start aid ever devised! If this was the first start after winter, then maybe don't worry too much. The cylinders will be dry and if any wear on bore or rings, they will not seal properly. Also, the battery may not be up to the job just after winter and turning the engine over too slowly.