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Old 02-03-2018, 09:48 PM   #1 (permalink)
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Default Part number, name, or some help from overheat?

Greetings everyone,

I have an '87 Samurai Tintop. Recently, the engine temp has been rising, especially when sitting in traffic. I tested the thermostat - it's fine. I flushed the coolant/radiator and refilled. I noticed small amounts of sticky, brownish residue in my expansion tank. I'm thinking small amounts of engine oil is finding its way into the coolant.

A few days ago, when driving, a tube ruptured - it split and started spewing coolant.

I have two questions:

1. Can anyone tell me the part number for the tube? It's the small, L-shaped tube that runs just under the thermostat housing. I believe it's a by-pass tube. (I tried replacing it with a piece of straight tubing, but without the molded angle, the tube kinks and restricts coolant passage). If not a part number, a source to buy this tube (new or used) would be great. Thanks!

2. Does anyone have any idea what may cause this tube to rupture? It split, as if cut with a razor. And the overheating?

Thank you for any help!
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Old 02-04-2018, 07:59 AM   #2 (permalink)
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17859-83000 or 17859-83001 - bypass hose.
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Old 02-04-2018, 10:25 AM   #3 (permalink)
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Thank you Fordem. I appreciate your help. I'll start looking to order it now.



If any one has any comments/thoughts about the overheating issue - possible causes - I'm open for input. I'm grateful to have this part number now, so I can be certain to order the right one & continue my diagnosis. I plan to do a leakdown test soon. I'd love to find a used bypass hose to one to swap, but used parts seem hard to find around here (Northeast USA).

Thanks again.
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Old 02-04-2018, 09:15 PM   #4 (permalink)
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Engine oil in the coolant points to a blown head gasket.
But are you sure it is oil not rust?

A blown gasket will cause overheating as it lets exhaust gasses into the coolant.
I would do a compression test on each cylinder.

If all cylinders check out OK, then get the cooling system pressure flushed to clean out all the crud and then refill with new coolant. Maybe your cooling system is just clogged up, causing it to overheat.

Alloy cylinder heads as in the Suzi need the coolant changed every 2 years or so to stop corrosion.
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Old 02-05-2018, 11:58 AM   #5 (permalink)
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Thank you Johnfromperth.

That's a good point you bring up about the rust. It's only trace amounts, but enough to be noticeable. I wasn't able to think of what else it could be. Though it does seem a little "gummy"/sticky to the touch (the residue).

I'll do the compression check. With my schedule, I'll likely have to wait until the weekend, but I'll post back with results/follow-up.

Thanks again.
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