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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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850 R engine rebuild time - what to be careful about?Views : 2426 Replies : 19Users Viewing This Thread : |
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Jul 28th, 2021, 05:43 | #1 |
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850 R engine rebuild time - what to be careful about?
So it turns up my 850R needs an engine rebuild. Stem seals are bad - it puffs blue from the exhaust after idling and then pressing the pedal (PCV was just cleaned). Crankcase pressure is also pretty high and I was told I'll need to change the head gasket. After picking the car up from my mechanic, he told me to just keep driving it for some time until the rebuild - I found that a bit crazy, given the symptoms, but did drive back home. The morning after, I realised I have a big leak (coolant). Took the car back to mechanic (not the same one). Turns out coolant hose connected to the turbo was pretty worn and plastic and it just gave up.
So, rebuild time it is. This was a part of the plan from the beginning - car is otherwise in great condition with bunch of new parts (including intercooler, turbo, gearbox, overhauled brakes, dressed with new alcantara, overhauled steering column, refurbished wheels etc...), I just hoped it won't be needed right away Anyways, I'm not having the job done by renowned Volvo specialist as first planned. Really didn't like the attitude as the guy kept whining and had a surprisingly negative approach. He told me to keep driving the car which was clearly in no condition to be driven and overtightened (and I mean, REALLY overtightened) the spark plugs. I lost all trust. So, I decided to have the work done by guys that aren't Volvo specialists, but do have the tools, knowledge and experience. They've put together a bunch of engines, including numerous race car projects. Now, my question is - are there any specifics with Volvo B5234T engines that need special attention? I'd like the job to be done by the book, within correct specs and well documented. I got time to prepare and would love to gather as much info as possible prior to start so any feedback, tips, links and general information is really appreciated. Thank you in advance! Frane |
Jul 28th, 2021, 06:56 | #2 | |
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My only advice is, if you have a budget double it and double it again, that should get you somewhere near the overall build cost!!! |
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Jul 28th, 2021, 07:02 | #3 |
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Last Online: Dec 21st, 2022 10:40
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My estimate is around 4-5K EUR (know of three T5 engine rebuilds done - all pretty much there). Labour alone around here is estimated to be around 1,5K (+/-) to give you some perspective.
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Jul 28th, 2021, 09:43 | #4 | |
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Jul 28th, 2021, 13:11 | #5 |
Grumpy Old Git
Last Online: Apr 19th, 2024 09:16
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If you have patience, tools and the time & space I'd say give it a go yourself, or at least do as much as you can - leave any machining work to specialists but do the strip down and assembly yourself if you feel confident? These aren't hugely complex engines but you do need to be scrupulously clean and methodical.
If you're after some guide prices, you could ask Tim Williams (on Facebook), Shem (https://www.facebook.com/shemtekautomotive) or there is an indy in York who is supposed to be very good - https://www.dyrdalsgarageyork.co.uk You could ask any/all of these places for a quote - that would give you a ballpark figure to consider. The other cheaper alternative, albeit not ideal, is to simply drop in another engine. Get an early S70/V70 B5234T3 engine as this has slightly stronger pistons etc. as shown in the attached technical bulletin. It is otherwise mechanically identical (barring a 16T turbo if its come from a manual car) and you can re-use all your sensors from your existing engine so it will continue to run fine on your Motronic 4.3 ECU. Obviously you'd need to make sure this engine is better than the one you have NB I realise you are in the Netherlands (?) but I can't recommend anyone over there as I have no knowledge of them, hence me suggesting a few that I do know of - and would use myself. HTH
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S40 2.4i '07 Japanese import '96 850R - https://www.volvoforums.org.uk/showthread.php?t=312484 Ex Danish Embassy '96 940 GLE LPT - https://www.volvoforums.org.uk/showthread.php?t=326071 |
Jul 28th, 2021, 13:21 | #6 |
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i wouldnt rebuild an N motor again, they wear heavily: barrelled bores, shorter rod is the culprit for this wear.
best bet would be to get hold of a late 2.3 single VVT engine and just fit your N head after its been skimmed, valves/guides checked and tested / new stem seals. these are short skirt pistons with a 147mm rod, much much better at not wearing its bores out. the later block has far superior oiling, a vastly lighter crank, windage ports at each cylinder base and can facilitate all your N parts aswell as a better PCV port size. RN oil pumps are 5h1t3, use your 850 one after youve opened it and inspected and cleaned it. you could use a B5244t5 bottom end also, but they cost more to acquire due to being the more desirable of the 2. Speak to Sebastien Schutten
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https://www.facebook.com/VolvoComposites/ Horsepower is how fast you hit the wall Torque is how far you take the wall with you Last edited by DunkinBiskits; Jul 28th, 2021 at 13:29. |
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Jul 28th, 2021, 13:24 | #7 |
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If you end up re building it is very important to clean/replace the oil pick up and replace all the relevent oil seals and o rings on the pick up pipe also use the correct volvo spec liquid sump seal as these are a zero tolerance fit . do not use any silicon seal or rtv .
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Jul 28th, 2021, 15:35 | #8 | |
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I love the 850R i have , had it 10 years and have juts spent 5k on engine and I did most of it myself ! Costs just went up and up. Also that saying .. whilst im here i might as well upgrade.. x y and z Make sure you REALLY want to keep the car before your spend your hard earned money on it ! And make sure you check the sills before you start !!!!!!!!!!!!!
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Jul 28th, 2021, 17:16 | #9 | ||||||
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Thank you all for great feedback!
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I'm in position to acquire a B5234T3 engine (2001 from C70T). - complete 850R head is a direct fit? - 850R oil pump should be kept as it's better? - all the sensors and original computer will fit? - no need for new turbo as existing head can be used. Quote:
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Jul 28th, 2021, 17:50 | #10 | |
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Thanx! Last edited by gofra; Jul 28th, 2021 at 18:57. |
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