OK so you all talked about this and nobody started it. So as a former 3126 Owner, I'll do it!
Official Caterpillar3116/3126 Thread
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carterchapman
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I believe they originally used a lower temp thermostat but now recommend (offer) the 190's. That may be why they are reading 180.
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5,220 Posts
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- Rochester, NY
Anyone know what the fuel return line fitting is coming off the fuel cooler?
I want to make up a small piece of clear hose so I can check for air in the return. I watched the cat tech do it on our other engine when the injector cups were replaced (combustion gasses running past the seals) and I would like to check the other engine once a year or so in case the other ones start leaking as well
The other test is to stick a hose in a bucket and watch for air bubbles in the return fuel but that's just asking for a mess imo
I want to make up a small piece of clear hose so I can check for air in the return. I watched the cat tech do it on our other engine when the injector cups were replaced (combustion gasses running past the seals) and I would like to check the other engine once a year or so in case the other ones start leaking as well
The other test is to stick a hose in a bucket and watch for air bubbles in the return fuel but that's just asking for a mess imo
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12,226 Posts
Engine diagnostic tests are seldom worth anything unless there is a reason to perform them. Air in the return system is one of t hem. If the engine is running normally with no missing what to you expect to gain or what do you expect to learn with the air in the return line test except that the engine is running normally……..which you already know.
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12,226 Posts
Cat cannot meet some EPA limit with the 6 cylinder 3100 series engine running at 180Ëš so to try to appease the EPA, they increased the thermostat's set point to 190Ëš. My engines do seem to produce marginally less transom soot with the 190Ëš thermostats, but the difference is so small that I never found transom sooting a problem with the original 180Ëš thermostats anyway.
Just a tangent question on this, what temp triggers a warning alarm , I assume it’s more than 190
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12,226 Posts
On my boat it triggered the systems monitor at a shade over 200Ëš. But, the dash gauges are less than infallible and determining the engine temperature required a bit of estimation/guessing. The engine mounted gauges were a little easier to read and tened to confirm the 200Ëš mark.
I have been on boats with newer systems monitors that alarmed at 210˚. Too hot for me on Diesel engines……..I'm pulling the throttles back well before 210˚ and on my older 450DA, if I hear the systems monitor cheap, I pull back the throttles.
I have been on boats with newer systems monitors that alarmed at 210˚. Too hot for me on Diesel engines……..I'm pulling the throttles back well before 210˚ and on my older 450DA, if I hear the systems monitor cheap, I pull back the throttles.
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7,716 Posts
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What's the best place on the engine to shoot a heat gun on to get true temperatures?
- Location
- Space Coast Florida
Thermostat housing.
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3,156 Posts
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- Western NY (Lake Erie)
Then after that shoot a bunch of different places and record the location and readings for future comparison, or make a video
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199 Posts
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Tried over the weekend to set up a descaling flush on the port engine. Using 2' barbed fittings I attached just after the raw water pump and again at the inlet to the exhaust. Had about 7 gallons of water in the bucket using a cheap 1100 gpm bilge pump. I had good flow at first coming from the outlet side but after about 2 minutes I was dry in the bucket. I couldn't see any leaks outside of a small drip at one of my connection points.Am I missing something? Will I loose solution down through the dripless line, or somewhere else I need to close off? Seacock was closed and had all the zinc caps back in. I was stumped and really hot by that point so I walked away. Thanks.
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3,156 Posts
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- Western NY (Lake Erie)
Yes, out the dripless seals. Pinch the hose off with a vise grip or clamp
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7,716 Posts
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- Virginia
Yes, I was told to close off the dripless line. Can you post everything you bought here, something I want to do as well.
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199 Posts
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Thanks guys, kinda thought that may have been it, but figured best to ask the brain trust.
Mrs R - I just went into Ace hardware and got (2) 2 inch pvc barbed to MPT fittings. From there you can downsize to whatever hose size you want to use. I had a length of bilge hose that I used for the pump side attached with a hose clamp. For the outlet side, I downsized to a standard garden hose barb since i had some old sections of that to cut up. Here's the pump I bought on Amazon - just added a couple of alligator clips. Since I am already sitting in the ER next to the batteries that seemed like a simple choice to power it up. It was flowing nicely... until it went dry.
https://www.amazon.com/dp/B07PGDKB5Y?ref=ppx_yo2ov_dt_b_product_details&th=1
Mrs R - I just went into Ace hardware and got (2) 2 inch pvc barbed to MPT fittings. From there you can downsize to whatever hose size you want to use. I had a length of bilge hose that I used for the pump side attached with a hose clamp. For the outlet side, I downsized to a standard garden hose barb since i had some old sections of that to cut up. Here's the pump I bought on Amazon - just added a couple of alligator clips. Since I am already sitting in the ER next to the batteries that seemed like a simple choice to power it up. It was flowing nicely... until it went dry.
https://www.amazon.com/dp/B07PGDKB5Y?ref=ppx_yo2ov_dt_b_product_details&th=1
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961 Posts
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- Northern Illinois
Does anyone have a link to a 3116 Parts diagram? I tried using my.cat.com and other sources on the Cat website, and I can't find a standard parts diagram to locate the parts I'm looking for.
A search by name doesn't work well if you don't know exactly what the part is called.
A search by name doesn't work well if you don't know exactly what the part is called.
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5,220 Posts
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- Rochester, NY
The SIS system is a fine art. Which part and what’s your engine SN?
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5,431 Posts
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961 Posts
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- Northern Illinois
Thanks @Strecker25 At the moment I'm trying to find the housing that the coolant temperature sensors sit in, but I'd like to find some source to know what part I'm trying to find. S/n is 4KG07441. Does everybody just call Cat every time you need to find a part?
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7,716 Posts
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Yes and No. I have an account set up online so I'll check online first.
My local cat dealer is heavy equipment and rarely understands my marine applications.
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961 Posts
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@Strecker25 I hadn't found the SIS system, and that probably gives me the diagrams I was looking for. I was trying to search on my.cat.com and wasn't getting anywhere. Thanks.
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5,220 Posts
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its much better than it used to be but still a pain at times. Sounds like you found the diagram but this is probably the one you want?
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