86_LE_MSP
11-01-2020, 02:38 PM
I have a 1986 Van LE with the 4Y-EC engine, AT, 2WD. I am not the original owner of the van. I purchased it at auction in Washington state in August, 2017. From my research, I believe this TV was first placed in service in British Columbia, Canada.
At the time of purchase it had a significant "tick" in the engine that I believed to be a stuck valve lifter. I have a local mechanic whom I trust, and who has worked on Toyota Vans since they were new ('85). He is generally knowledgeable, but not a specific TV specialist. He first diagnosed the problem as a stuck valve lifter in one cylinder. I believe he meant the cylinder first in order in the engine. He has now opened the engine to examine the lifters and valves with the goal of eliminating the noticeable "tick". He reported that the valves on top have collapsed lifters, and that there is ~90 thousands or about 1/4 inch rocker movement. He considered this to be excessive, and because the valves are not adjustable on this engine, was cautious about moving forward. He called to check in with me on next steps. My purpose in writing here is to gain additional information and benefit from other's experience.
Is this amount of rocker movement normal with non-adjustable valves?
Based on the description, will replacing the lifters alone solve the problem?
Could this be more broadly connected to the camshaft itself, thereby requiring replacement as well?
Is it likely that the engine has been more significantly damaged in the past, and will require replacement?
Are there other diagnostic tools or measurements that will assist in determining next steps?
Is it likely to be more cost effective to replace the engine at this point vs. repairing it?
Thanks for your input and assistance.
Dan
Dan
At the time of purchase it had a significant "tick" in the engine that I believed to be a stuck valve lifter. I have a local mechanic whom I trust, and who has worked on Toyota Vans since they were new ('85). He is generally knowledgeable, but not a specific TV specialist. He first diagnosed the problem as a stuck valve lifter in one cylinder. I believe he meant the cylinder first in order in the engine. He has now opened the engine to examine the lifters and valves with the goal of eliminating the noticeable "tick". He reported that the valves on top have collapsed lifters, and that there is ~90 thousands or about 1/4 inch rocker movement. He considered this to be excessive, and because the valves are not adjustable on this engine, was cautious about moving forward. He called to check in with me on next steps. My purpose in writing here is to gain additional information and benefit from other's experience.
Is this amount of rocker movement normal with non-adjustable valves?
Based on the description, will replacing the lifters alone solve the problem?
Could this be more broadly connected to the camshaft itself, thereby requiring replacement as well?
Is it likely that the engine has been more significantly damaged in the past, and will require replacement?
Are there other diagnostic tools or measurements that will assist in determining next steps?
Is it likely to be more cost effective to replace the engine at this point vs. repairing it?
Thanks for your input and assistance.
Dan
Dan