Using a scope to help decide to take apart an engine
I'm sure we have all been there where we become “gun-shy” on making a call for a repair that we are about to recommend.
This was what I ran into on this particular vehicle and situation. Partially due to that fact that when performing a test that I have become comfortable with to be able to identify a problem comes out with a result that I hadn't yet seen. Despite that fact that symptoms basically would generically guide you to the possible issue, I was looking for the testing to just simply back that up. Then I was faced with trying to avoid making a call from what looks like an obvious fault , to having to deal with a more expensive recommendation after going forward with the initial call
I wanted to share so that you could follow some of the testing procedures that I performed and why I did them to come up with a conclusive call. I hope that it helps some of you in your day to day testing and thank you in advance.
Hi Sadel, This spells a severely warped head in my opinion. This thing has been run a lot after it was too hot. The compression pressure is being forced into the cooling system. Normally by ‘quick testing’ the cooling system will not correspond with a particular cylinder. At minimum send the head to a machine shop for pressure testing. Good you narrowed it down to the cylinders 2&3. As…
Yes Glenn the radiator ended up being ok, I confirmed that nothing else was needed with extensive driving that I usually do with major repairs.
Hi Sadel, Good deal. If anything is to happen, it is best while you still have it there.
Hi Sadel, How did you set up the coolant pressure tester? I have usually went with the old Stant test and watched the needle bounce or climb, that is pretty crude I know, but it works pretty often on severe cases.
I simply just use all available tools that are out there already for performing coolant system pressure tests. I have the “master kit” for various screw on adapters for different reservoir types, and then connect the pressure adapter cap but simply remove the hose from it and it is now at that point just a barb fitting that now becomes your port into the coolant system. Then I simply connect…
Hi Sadel, Back in the ‘old days’ before scopes and pressure transducer became more popular, every vehicle was a major task. Performing rudimentary tests, working up to no other choice but performing teardown “exploratory surgery” was a common event. I recall several times where an internal engine issue was not the issue, so the shop would cover it up and still charge the customer to hide the…
Fantastic !! Well done and indeed whilst it may be boring for some I enjoyed every second of it. What transducers did you use and is the adaptor on the expansion bottle for say a coolant pressure test kit or something more specific ??
Hey Martin, Yes the adapters that I use are from a coolant pressure test kit. As far as the transducers, it depends on the scaling, if needing sensitive readings a pulse sensor or inches of water will work, or wps set on lowest scale, and if needing higher psi readings, any positive reading transducer will work like snap on , wps, and others alike.
Very well done. Great job to analyze the necessary repair. Your skills are impeccable. Our lost art of diagnosis.
Thank You Rick, Very much appreciate the kind words, I find enjoyment in spending the time in breaking diags down to this extent, I feel it helps build my skill level as an individual who is faced with trouble vehicles, and it's why I felt I wanted to share these methods to help others be exposed to some different approaches