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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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V70R T5 bent con rod. Cause?Views : 654 Replies : 6Users Viewing This Thread : |
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May 6th, 2019, 19:11 | #1 |
Junior Member
Last Online: Dec 10th, 2023 09:37
Join Date: Oct 2013
Location: bath
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V70R T5 bent con rod. Cause?
Hi,
Last week i was driving to work, put my foot down on a hill, felt a big misfire followed by a sound like a machine gun. Scratched my head for ages, googled a bit and found these engines are known for bending rods if the turbo over boosts. Well, i've stripped the engine (what a job!!) and sure enough, bent number 2. I've been fairly lucky in as much as nothing else is damaged so it is repairable. My question though, is what caused it? Most theories seem to suggest a vacuum leak between the boost control solenoid and the wastegate but i have previously replaced all these vacuum hoses and they're still in good shape. If i suck on the pipes to the turbo i can't pull any air through them so i assume the pipes and diaphragms are in good order. Is it possible it's the boost control solenoid itself? Is there anything else i should check? Also, has anybody had any good/bad experiences with these con rods? https://www.ebay.co.uk/itm/4340-TuV-...cAAOSwIVVcky-3 Or can anyone suggest an alternative that isn't going to cost the earth? Many thanks Dave |
May 6th, 2019, 21:33 | #2 |
C70 T5
Last Online: Mar 23rd, 2022 22:00
Join Date: Sep 2006
Location: Midlands
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Tcv / boost solenoids may appear ok but with age/wear etc they can cause the turbo to over boost the wrong way causing the very issue you describe. It’s why changing the TCV frequently such as every couple of years, is strongly advised.
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2000 C70 T5 GT Coupe 1998 S70R / 1995 Toyota Supra Twin Turbo 2007 Mercedes CLS 320 CDI / 2011 Mercedes S350 Bluetec 2007 Suzuki GSXR-1000 |
May 6th, 2019, 22:27 | #3 |
Premier Member
Last Online: Sep 14th, 2022 18:04
Join Date: Feb 2018
Location: Derbyshire
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Interesting - where do you recommend getting them from? Is Volvo the only source? Or are aftermarket or DIY options viable?
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1995 Volvo 850 T5 Estate (Manual) |
May 6th, 2019, 23:05 | #4 |
C70 T5
Last Online: Mar 23rd, 2022 22:00
Join Date: Sep 2006
Location: Midlands
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FRF volvo - we get a forum discount.
I do about about 800 miles a week and change mine annually for peace of mind. There are other options such as over hyped performance items such as IPD but it’s just hype and over priced to con those who don’t know better.
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2000 C70 T5 GT Coupe 1998 S70R / 1995 Toyota Supra Twin Turbo 2007 Mercedes CLS 320 CDI / 2011 Mercedes S350 Bluetec 2007 Suzuki GSXR-1000 |
May 7th, 2019, 22:33 | #5 |
Junior Member
Last Online: Dec 10th, 2023 09:37
Join Date: Oct 2013
Location: bath
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That's very interesting, I sort of assumed it would either work or not. In that case i will replace it regardless as i know it hasn't had one in many years. I will give everything a thorough checking over before i put it all back together too. It's in incredibly good condition inside considering its done about 170,000 miles.
Thanks Dave |
May 8th, 2019, 18:51 | #6 |
C70 T5
Last Online: Mar 23rd, 2022 22:00
Join Date: Sep 2006
Location: Midlands
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I left mine a little longer than the usual annual (30,000 miles for me) as it just slipped my mind.
The car still felt ace and smooth but, after replacement, its MUCH more torquey and responsive.
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2000 C70 T5 GT Coupe 1998 S70R / 1995 Toyota Supra Twin Turbo 2007 Mercedes CLS 320 CDI / 2011 Mercedes S350 Bluetec 2007 Suzuki GSXR-1000 |
Jun 2nd, 2019, 09:00 | #7 | |
Senior Member
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Quote:
Have fitted the same conrods you are looking at and I've never looked back just make sure you check your clearances on the replacement bearings you're using. https://youtu.be/p-zSPtrK7bw This is a video of the noise of mine before and after
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Current Cars Volvo 850R Estate 1996 Manual Conversion SLK AMG 350 R172 |
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