Blowing sound from intake valves

Just to be clear you have valves hanging open after running the engine?

If this is the case, then the cause of a sticking valve is normally heat but this would take longer than a few miles. So, what it sounds like is the valve guides are too tight and it is causing the valves to stick and hang open.

You can confirm this is happening again by running a compression check before you remove the head again. Here is a guide that will help with this:

https://www.2carpros.com/articles/how-to-test-engine-compression

So more than likely the valve guides are the issue, or the head is damaged in ways that I am not sure yet.

What is the history of this vehicle? Why did you originally do the top end overhaul? Did you have an issue prior to this, and did you replace the guides?

Let's start with this info and go from there.

Thanks

The reason for doing the top-end was after one overhead cam broke, resulting in a bent valve, the engineers say they have replaced all the valves and buckets. I inspected my bottom half, and all seems fine except for the head, it only happens after running when the engine has reached optimum temperatures.

Check the guides as well. They may be causing the valve not to seat when it gets hot.

Roy

Sure, thanks. will check and update.

Please keep us updated.

Roy

Thanks so much for the assistance the problem has been resolved.

I have another problem developing from another YD25 engine. When driving it's having intermittent power loss. have replaced the prime pump, sediment sensor cleaned the fuel tank, and put new diesel filter, still, I am having the same problem.
when driving the vehicle just loses power.

Site rules are one subject per question.

Please start a new question and we will be glad to help you.

Roy