Renegade

In the days following I'll pull the head of my H22A8 to replace a suposedly blown head gasket. Spet by step we will evaluate engine condition and replace all the necessary parts. So HG and then valve seals. If there ain't any scratch marks on the cyl. walls I intend to replace piston rings. But what about the connecting rod bearings?? How to know if they are in good shape? Obviusly if they have scratch marks they should be replaced. But otherwise - should I keep them? In which case scenario should I replace the conn. rod bearings?

Thanks!

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2000 VTi BB8, H22A8, //-// 4WS

AllMotorBB6

Bearing Wear Analysis

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Blake - Neptune Tuner/Dealer
ALL MOTOR big body honda that will eat your lunch

kooler

I think allmotorbb link should answer most of ur questions, as its pretty easy to understand

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Vertical Doors Turbo Kits performance parts

Renegade

Yes it does Thanks.

If I can stretch this thread further to 'My rebuild' I would like to attach some pictures. Today the head of my H22A8 went off. Under really hard driving I could achieve a consumption of a gallon of oil (Castrol TXT 5W-40) in 6.000 miles. This is how the engine looks after 120.000 miles of hard driving.

Because the cyl walls are smooth, no scrathes or onything, tomorrow we'll pull down the bottom end to inspect the connecting rod bearing. The plan is, as I said, to replace piston rings and connecting rod bearing. More of those pictures tomorrow.
For now I would like to hear some opinions on the condition of the engine. Particulary about the valves. Intake is full of oil deposit, so I'm thinking of an oil catch can in the future. Spark plugs seem to be OK? Intake butterfly need cleaning.

Attached Thumbnails

         

 

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2000 VTi BB8, H22A8, //-// 4WS

Renegade

OK, so these are the pictures of bearings. They need to be replaced. They show signs of 'cold start' wear (previous owner I guess).
But now I have a question. Can I use OEM thickness or should the crankshaft be measured for wear and use thicker connecting rod bearings?

Attached Thumbnails

     

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2000 VTi BB8, H22A8, //-// 4WS

AndOne

Well it looks to me like u we're flooring it a lot, piston heads and combustion chamber dark black, ie running rich common with WOT, and as well as the spark plugs are burned white most the way down another indication of full timing advance with WOT. As for my opinion on the cylinder walls and overall condition of the engine looks pretty good. Go Honda engineering.

For a blown head gasket i'd expect to see it cleaner in there or one piston bore to be more shiny, metallic color, and clean looking cuz when coolant burns it cleans out carbon deposits. . .

Well since a picture is worth a thousand words but engines are about that very fine line with clearances of .010 to .001 that make the difference and since i can't really see in those pics from what i seen i don't see a problem. I can tell how you drive tho

I'm sure my engine would look quite similar, the VTEC addiction, well actually mentioning i think the cylinder walls were kinda oily and the texture in the pics might indicate that they are getting worn out of clearances with the piston rings. Can't tell if there's ring ridge at the top of the cylinders but that looks fine from the pic angle and resolution. Oil and coolant passage ways look clean though.

The valves look relatively norm from the pic too, exhaust look burnt and the intake look carbonized, normal wear from what i see. but depends on ur mileage it could just be time for valve clearances to be adjusted, too. Did u get a vacuum reading on it b4 u took it apart? what about compression leakdown tests?

AndOne

If ur gonna take the motor down that far i say u really should measure the crankshaft for wear and make ur decision off of that. i don't like the idea of getting shimmed bearings to compensate, i'd also think about the cost of replacing the crank or getting it balanced/ machined to perfection.

The scratches in the 2nd pic are pretty bad so yeah either way those are goin.

and thats pretty much my 2c for looking at them pics for 5-10 mins GL!

Renegade

Wow, thanks
Yeah using WOT was my practice. I requested compression and leakdown test but was never done prior to the engine stripping. Right now everything is open and parts are ordered. Mechanic will order the same color bearing. We'll check the clearance with plastigauge. If any of them will be out of max. tolerance we'll replace them with thicker ones. I bealieve that softer bearings took the abuse and the crankshaft should be OK. But I'll insist on mechanic to measure it. That's the way things roll if you don't do them yourself.

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2000 VTi BB8, H22A8, //-// 4WS