1999 V70 Engine Swap - Comptability Answer, B5254t Vs B5244t3 Engines

[jdpowerski]

On August 4th, I posted...

Hi folks,

I am in the midst of having my 1999 V70 engine replaced due to a timing belt tensioner problem that caused valve damage. My original engine was a B5254T (w/ low pressure turbo). The replacement engine which I have purchased and had shipped from a salvage yard (after providing them my VIN #) turns out to be a B5244T3. Please can you tell if this engine is a drop in replacement? I understand that Volvo changed the engine codes in late 1999 to meet an EC requirement that the displacement identified should properly match actual (e.g. B525 = 2.5L, whereas B524=2.4 liter, closer to the actual of 2435 cc). I'm concerned that this alternate engine may have other design changes which will make it not work properly/optimally in my car with all other original peripherals / computer, etc.

Does anyone have any experience with this? Please help.

Thanks,

JD

1998 S70

1999 V70

____________

Sept 4th Update

I'm posting the results to this motor swap operation since the industry knowledge on this item had great uncertainty of what would be the outcome. Would it work at all? Would the car be plagued with a check engine light that would require months of troubleshotting? I'm grateful for the input I did receive and although a number of respected sources strongly cautioned against this operation, I decided to bite the bullet and advance the realm of automotive franken-science by doing the transplant and working through whatever problems would arise.

There were none. It was a complete success. No engine codes.

My B5244T3 engine (2001 vintage I believe) procured from a salvage yard, works perfectly in the 1999 V70, connected to drive train, sensors and ECU that are expecting to see the old B5254T. The throttle body from the older B5254T motor was put on the new intake manifold, since I understand this item is programed and calibrated to the original ECU. The new turbo came with the engine and we are using that. The sweet news is that highway mileage has increased from 26 MPG to 32 MPG. Power and acceleration feel just like they did before.

BTW, the cause of the original engine failure turned out to be the coolant loss, not enough to cause overheating, but enough to cause the original water pump to seize at 149K miles. (Meanwhile the coolant reservoir registered full, so I suspect a leak and maybe a problem with the thermostat.) This in turn locked up the timing belt as the cams continued to spin while the car cruised at 70 mph. There was a loud clunk and then the motor came to an abrupt halt. The tell tale sign of the problem onset was a chirping / gargling / bubbling noise that we couldn't determine the cause of soon enough.

Regards,

JD :D

[Chilled man]

99 -08 and up engines are pretty much exactly the same

93-98 engines are pretty much exaclty the same

[Ghost Shadow]

99 -08 and up engines are pretty much exactly the same

93-98 engines are pretty much exaclty the same

post whore, that was a useless post like this one.

JD actually posted good info. I am in the same position, i can find the B5244T3 engine easy, EXACTLY for the xc is the B5254T, that's hard.

this means alot.